64615566401 has 2 divisors, whose sum is σ = 64615566402. Its totient is φ = 64615566400.

The previous prime is 64615566347. The next prime is 64615566439. The reversal of 64615566401 is 10466551646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58490938801 + 6124627600 = 241849^2 + 78260^2 .

It is a cyclic number.

It is not a de Polignac number, because 64615566401 - 2¹⁴ = 64615550017 is a prime.

It is not a weakly prime, because it can be changed into another prime (64615566451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32307783200 + 32307783201.

It is an arithmetic number, because the mean of its divisors is an integer number (32307783201).

Almost surely, 2^64615566401 is an apocalyptic number.

It is an amenable number.

64615566401 is a deficient number, since it is larger than the sum of its proper divisors (1).

64615566401 is an equidigital number, since it uses as much as digits as its factorization.

64615566401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 518400, while the sum is 44.

The spelling of 64615566401 in words is "sixty-four billion, six hundred fifteen million, five hundred sixty-six thousand, four hundred one".