77964847577 has 2 divisors, whose sum is σ = 77964847578. Its totient is φ = 77964847576.

The previous prime is 77964847523. The next prime is 77964847651. The reversal of 77964847577 is 77574846977.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68214470041 + 9750377536 = 261179^2 + 98744^2 .

It is a cyclic number.

It is not a de Polignac number, because 77964847577 - 2²⁶ = 77897738713 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77964847577.

It is not a weakly prime, because it can be changed into another prime (77964843577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38982423788 + 38982423789.

It is an arithmetic number, because the mean of its divisors is an integer number (38982423789).

Almost surely, 2^77964847577 is an apocalyptic number.

It is an amenable number.

77964847577 is a deficient number, since it is larger than the sum of its proper divisors (1).

77964847577 is an equidigital number, since it uses as much as digits as its factorization.

77964847577 is an evil number, because the sum of its binary digits is even.

The product of its digits is 580849920, while the sum is 71.

The spelling of 77964847577 in words is "seventy-seven billion, nine hundred sixty-four million, eight hundred forty-seven thousand, five hundred seventy-seven".