79902056891505 has 64 divisors (see below), whose sum is σ = 131844955253760. Its totient is φ = 41300320379136.

The previous prime is 79902056891497. The next prime is 79902056891507. The reversal of 79902056891505 is 50519865020997.

It is not a de Polignac number, because 79902056891505 - 2³ = 79902056891497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (79902056891507) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 447223002 + ... + 447401628.

It is an arithmetic number, because the mean of its divisors is an integer number (2060077425840).

Almost surely, 2^{79902056891505} is an apocalyptic number.

It is an amenable number.

79902056891505 is a deficient number, since it is larger than the sum of its proper divisors (51942898362255).

79902056891505 is a wasteful number, since it uses less digits than its factorization.

79902056891505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185550.

The product of its (nonzero) digits is 61236000, while the sum is 66.

The spelling of 79902056891505 in words is "seventy-nine trillion, nine hundred two billion, fifty-six million, eight hundred ninety-one thousand, five hundred five".