77964788691 has 24 divisors (see below), whose sum is σ = 113138088336. Its totient is φ = 51735628800.

The previous prime is 77964788653. The next prime is 77964788813. The reversal of 77964788691 is 19688746977.

77964788691 is a `hidden beast` number, since 7 + 7 + 96 + 478 + 8 + 69 + 1 = 666.

It is not a de Polignac number, because 77964788691 - 2⁷ = 77964788563 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77964788621) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9329571 + ... + 9337923.

It is an arithmetic number, because the mean of its divisors is an integer number (4714087014).

Almost surely, 2^77964788691 is an apocalyptic number.

77964788691 is a deficient number, since it is larger than the sum of its proper divisors (35173299645).

77964788691 is a wasteful number, since it uses less digits than its factorization.

77964788691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13043 (or 13040 counting only the distinct ones).

The product of its digits is 256048128, while the sum is 72.

The spelling of 77964788691 in words is "seventy-seven billion, nine hundred sixty-four million, seven hundred eighty-eight thousand, six hundred ninety-one".