64431461729 has 2 divisors, whose sum is σ = 64431461730. Its totient is φ = 64431461728.

The previous prime is 64431461639. The next prime is 64431461737. The reversal of 64431461729 is 92716413446.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57301348129 + 7130113600 = 239377^2 + 84440^2 .

It is a cyclic number.

It is not a de Polignac number, because 64431461729 - 2²⁸ = 64163026273 is a prime.

It is not a weakly prime, because it can be changed into another prime (64431461329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32215730864 + 32215730865.

It is an arithmetic number, because the mean of its divisors is an integer number (32215730865).

Almost surely, 2^64431461729 is an apocalyptic number.

It is an amenable number.

64431461729 is a deficient number, since it is larger than the sum of its proper divisors (1).

64431461729 is an equidigital number, since it uses as much as digits as its factorization.

64431461729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 47.

The spelling of 64431461729 in words is "sixty-four billion, four hundred thirty-one million, four hundred sixty-one thousand, seven hundred twenty-nine".