64538901631889 has 2 divisors, whose sum is σ = 64538901631890. Its totient is φ = 64538901631888.

The previous prime is 64538901631861. The next prime is 64538901631903. The reversal of 64538901631889 is 98813610983546.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57387063930625 + 7151837701264 = 7575425^2 + 2674292^2 .

It is a cyclic number.

It is not a de Polignac number, because 64538901631889 - 2²⁴ = 64538884854673 is a prime.

It is not a weakly prime, because it can be changed into another prime (64538901691889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32269450815944 + 32269450815945.

It is an arithmetic number, because the mean of its divisors is an integer number (32269450815945).

Almost surely, 2^{64538901631889} is an apocalyptic number.

It is an amenable number.

64538901631889 is a deficient number, since it is larger than the sum of its proper divisors (1).

64538901631889 is an equidigital number, since it uses as much as digits as its factorization.

64538901631889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 268738560, while the sum is 71.

The spelling of 64538901631889 in words is "sixty-four trillion, five hundred thirty-eight billion, nine hundred one million, six hundred thirty-one thousand, eight hundred eighty-nine".