64402643177 has 2 divisors, whose sum is σ = 64402643178. Its totient is φ = 64402643176.

The previous prime is 64402643159. The next prime is 64402643191. The reversal of 64402643177 is 77134620446.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64368256681 + 34386496 = 253709^2 + 5864^2 .

It is a cyclic number.

It is not a de Polignac number, because 64402643177 - 2²⁰ = 64401594601 is a prime.

It is not a weakly prime, because it can be changed into another prime (64402643117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32201321588 + 32201321589.

It is an arithmetic number, because the mean of its divisors is an integer number (32201321589).

Almost surely, 2^64402643177 is an apocalyptic number.

It is an amenable number.

64402643177 is a deficient number, since it is larger than the sum of its proper divisors (1).

64402643177 is an equidigital number, since it uses as much as digits as its factorization.

64402643177 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 677376, while the sum is 44.

The spelling of 64402643177 in words is "sixty-four billion, four hundred two million, six hundred forty-three thousand, one hundred seventy-seven".