64397344961 has 2 divisors, whose sum is σ = 64397344962. Its totient is φ = 64397344960.

The previous prime is 64397344931. The next prime is 64397345053. The reversal of 64397344961 is 16944379346.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55696000000 + 8701344961 = 236000^2 + 93281^2 .

It is a cyclic number.

It is not a de Polignac number, because 64397344961 - 2¹⁸ = 64397082817 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64397344897 and 64397344906.

It is not a weakly prime, because it can be changed into another prime (64397344931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32198672480 + 32198672481.

It is an arithmetic number, because the mean of its divisors is an integer number (32198672481).

Almost surely, 2^64397344961 is an apocalyptic number.

It is an amenable number.

64397344961 is a deficient number, since it is larger than the sum of its proper divisors (1).

64397344961 is an equidigital number, since it uses as much as digits as its factorization.

64397344961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11757312, while the sum is 56.

The spelling of 64397344961 in words is "sixty-four billion, three hundred ninety-seven million, three hundred forty-four thousand, nine hundred sixty-one".