77864718697 has 2 divisors, whose sum is σ = 77864718698. Its totient is φ = 77864718696.

The previous prime is 77864718677. The next prime is 77864718731. The reversal of 77864718697 is 79681746877.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52846653456 + 25018065241 = 229884^2 + 158171^2 .

It is a cyclic number.

It is not a de Polignac number, because 77864718697 - 2³⁵ = 43504980329 is a prime.

It is not a weakly prime, because it can be changed into another prime (77864718637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38932359348 + 38932359349.

It is an arithmetic number, because the mean of its divisors is an integer number (38932359349).

Almost surely, 2^77864718697 is an apocalyptic number.

It is an amenable number.

77864718697 is a deficient number, since it is larger than the sum of its proper divisors (1).

77864718697 is an equidigital number, since it uses as much as digits as its factorization.

77864718697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 199148544, while the sum is 70.

The spelling of 77864718697 in words is "seventy-seven billion, eight hundred sixty-four million, seven hundred eighteen thousand, six hundred ninety-seven".