65431213457 has 2 divisors, whose sum is σ = 65431213458. Its totient is φ = 65431213456.

The previous prime is 65431213447. The next prime is 65431213469. The reversal of 65431213457 is 75431213456.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53457601681 + 11973611776 = 231209^2 + 109424^2 .

It is a cyclic number.

It is not a de Polignac number, because 65431213457 - 2²⁰ = 65430164881 is a prime.

It is not a weakly prime, because it can be changed into another prime (65431213417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32715606728 + 32715606729.

It is an arithmetic number, because the mean of its divisors is an integer number (32715606729).

Almost surely, 2^65431213457 is an apocalyptic number.

It is an amenable number.

65431213457 is a deficient number, since it is larger than the sum of its proper divisors (1).

65431213457 is an equidigital number, since it uses as much as digits as its factorization.

65431213457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 302400, while the sum is 41.

Subtracting 65431213457 from its reverse (75431213456), we obtain a palindrome (9999999999).

The spelling of 65431213457 in words is "sixty-five billion, four hundred thirty-one million, two hundred thirteen thousand, four hundred fifty-seven".