64961265497 has 2 divisors, whose sum is σ = 64961265498. Its totient is φ = 64961265496.

The previous prime is 64961265493. The next prime is 64961265503. The reversal of 64961265497 is 79456216946.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55571461696 + 9389803801 = 235736^2 + 96901^2 .

It is a cyclic number.

It is not a de Polignac number, because 64961265497 - 2² = 64961265493 is a prime.

It is not a weakly prime, because it can be changed into another prime (64961265493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32480632748 + 32480632749.

It is an arithmetic number, because the mean of its divisors is an integer number (32480632749).

Almost surely, 2^64961265497 is an apocalyptic number.

It is an amenable number.

64961265497 is a deficient number, since it is larger than the sum of its proper divisors (1).

64961265497 is an equidigital number, since it uses as much as digits as its factorization.

64961265497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19595520, while the sum is 59.

The spelling of 64961265497 in words is "sixty-four billion, nine hundred sixty-one million, two hundred sixty-five thousand, four hundred ninety-seven".