999771950440033 has 4 divisors (see below), whose sum is σ = 999772023461380. Its totient is φ = 999771877418688.

The previous prime is 999771950440019. The next prime is 999771950440049. The reversal of 999771950440033 is 330044059177999.

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 910387178700129 + 89384771739904 = 30172623^2 + 9454352^2 .

It is a 3-Lehmer number, since φ(999771950440033) divides (999771950440033-1)³.

It is a cyclic number.

It is not a de Polignac number, because 999771950440033 - 2⁴⁹ = 436821997018721 is a prime.

It is a super-2 number, since 2×999771950440033² (a number of 31 digits) contains 22 as substring.

It is a deceptive number, since it divides R_{999771950440032}.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999771950440633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9127668 + ... + 45638341.

It is an arithmetic number, because the mean of its divisors is an integer number (249943005865345).

It is a Poulet number, since it divides 2^{999771950440032}-1.

Almost surely, 2^{999771950440033} is an apocalyptic number.

999771950440033 is the 18255337-th octagonal number.

It is an amenable number.

999771950440033 is a deficient number, since it is larger than the sum of its proper divisors (73021347).

999771950440033 is a wasteful number, since it uses less digits than its factorization.

999771950440033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73021346.

The product of its (nonzero) digits is 231472080, while the sum is 70.

The spelling of 999771950440033 in words is "nine hundred ninety-nine trillion, seven hundred seventy-one billion, nine hundred fifty million, four hundred forty thousand, thirty-three".