85309911975972 has 12 divisors (see below), whose sum is σ = 199056461277296. Its totient is φ = 28436637325320.

The previous prime is 85309911975971. The next prime is 85309911975979. The reversal of 85309911975972 is 27957911990358.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 85309911975894 and 85309911975903.

It is not an unprimeable number, because it can be changed into a prime (85309911975971) 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, 3554579665654 + ... + 3554579665677.

Almost surely, 2^{85309911975972} is an apocalyptic number.

It is an amenable number.

85309911975972 is an abundant number, since it is smaller than the sum of its proper divisors (113746549301324).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

85309911975972 is a wasteful number, since it uses less digits than its factorization.

85309911975972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7109159331338 (or 7109159331336 counting only the distinct ones).

The product of its (nonzero) digits is 385786800, while the sum is 75.

The spelling of 85309911975972 in words is "eighty-five trillion, three hundred nine billion, nine hundred eleven million, nine hundred seventy-five thousand, nine hundred seventy-two".