79725431641 has 16 divisors (see below), whose sum is σ = 86050045440. Its totient is φ = 73595059200.

The previous prime is 79725431633. The next prime is 79725431647. The reversal of 79725431641 is 14613452797.

It is a cyclic number.

It is not a de Polignac number, because 79725431641 - 2³ = 79725431633 is a prime.

It is a super-2 number, since 2×79725431641² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79725431647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6225 + ... + 399361.

It is an arithmetic number, because the mean of its divisors is an integer number (5378127840).

Almost surely, 2^79725431641 is an apocalyptic number.

It is an amenable number.

79725431641 is a deficient number, since it is larger than the sum of its proper divisors (6324613799).

79725431641 is a wasteful number, since it uses less digits than its factorization.

79725431641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393384.

The product of its digits is 1270080, while the sum is 49.

The spelling of 79725431641 in words is "seventy-nine billion, seven hundred twenty-five million, four hundred thirty-one thousand, six hundred forty-one".