999811752061 has 2 divisors, whose sum is σ = 999811752062. Its totient is φ = 999811752060.

The previous prime is 999811752047. The next prime is 999811752067. The reversal of 999811752061 is 160257118999.

999811752061 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 990610146436 + 9201605625 = 995294^2 + 95925^2 .

It is a cyclic number.

It is not a de Polignac number, because 999811752061 - 2¹⁵ = 999811719293 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 999811751987 and 999811752005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999811752067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499905876030 + 499905876031.

It is an arithmetic number, because the mean of its divisors is an integer number (499905876031).

Almost surely, 2^999811752061 is an apocalyptic number.

999811752061 is the 447172-nd centered decagonal number.

It is an amenable number.

999811752061 is a deficient number, since it is larger than the sum of its proper divisors (1).

999811752061 is an equidigital number, since it uses as much as digits as its factorization.

999811752061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2449440, while the sum is 58.

The spelling of 999811752061 in words is "nine hundred ninety-nine billion, eight hundred eleven million, seven hundred fifty-two thousand, sixty-one".