999634121073253 has 4 divisors (see below), whose sum is σ = 999634188143020. Its totient is φ = 999634054003488.

The previous prime is 999634121073239. The next prime is 999634121073281. The reversal of 999634121073253 is 352370121436999.

999634121073253 is a nontrivial binomial coefficient, being equal to C(44713178, 2).

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 558839813082849 + 440794307990404 = 23639793^2 + 20995102^2 .

It is a 3-Lehmer number, since φ(999634121073253) divides (999634121073253-1)³.

It is a cyclic number.

It is not a de Polignac number, because 999634121073253 - 2²⁵ = 999634087518821 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999634121073223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1 + ... + 44713177.

It is an arithmetic number, because the mean of its divisors is an integer number (249908547035755).

It is a Poulet number, since it divides 2^{999634121073252}-1.

Almost surely, 2^{999634121073253} is an apocalyptic number.

999634121073253 is the 44713177-th triangular number and also the 22356589-th hexagonal number.

999634121073253 is the 14904393-rd centered nonagonal number.

It is an amenable number.

999634121073253 is a deficient number, since it is larger than the sum of its proper divisors (67069767).

999634121073253 is a wasteful number, since it uses less digits than its factorization.

999634121073253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67069766.

The product of its (nonzero) digits is 66134880, while the sum is 64.

The spelling of 999634121073253 in words is "nine hundred ninety-nine trillion, six hundred thirty-four billion, one hundred twenty-one million, seventy-three thousand, two hundred fifty-three".