77912164509 has 16 divisors (see below), whose sum is σ = 105463081152. Its totient is φ = 51151782528.

The previous prime is 77912164507. The next prime is 77912164571. The reversal of 77912164509 is 90546121977.

It is not a de Polignac number, because 77912164509 - 2¹ = 77912164507 is a prime.

It is a super-2 number, since 2×77912164509² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77912164507) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 685507 + ... + 791039.

It is an arithmetic number, because the mean of its divisors is an integer number (6591442572).

Almost surely, 2^77912164509 is an apocalyptic number.

It is an amenable number.

77912164509 is a deficient number, since it is larger than the sum of its proper divisors (27550916643).

77912164509 is a wasteful number, since it uses less digits than its factorization.

77912164509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109276.

The product of its (nonzero) digits is 952560, while the sum is 51.

The spelling of 77912164509 in words is "seventy-seven billion, nine hundred twelve million, one hundred sixty-four thousand, five hundred nine".