77957694691 has 2 divisors, whose sum is σ = 77957694692. Its totient is φ = 77957694690.

The previous prime is 77957694673. The next prime is 77957694707. The reversal of 77957694691 is 19649675977.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77957694691 - 2²⁷ = 77823476963 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77957694691.

It is not a weakly prime, because it can be changed into another prime (77957694601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38978847345 + 38978847346.

It is an arithmetic number, because the mean of its divisors is an integer number (38978847346).

Almost surely, 2^77957694691 is an apocalyptic number.

77957694691 is a deficient number, since it is larger than the sum of its proper divisors (1).

77957694691 is an equidigital number, since it uses as much as digits as its factorization.

77957694691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 180033840, while the sum is 70.

The spelling of 77957694691 in words is "seventy-seven billion, nine hundred fifty-seven million, six hundred ninety-four thousand, six hundred ninety-one".