964405637521 has 2 divisors, whose sum is σ = 964405637522. Its totient is φ = 964405637520.

The previous prime is 964405637453. The next prime is 964405637527. The reversal of 964405637521 is 125736504469.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 856106067600 + 108299569921 = 925260^2 + 329089^2 .

It is a cyclic number.

It is not a de Polignac number, because 964405637521 - 2²⁵ = 964372083089 is a prime.

It is not a weakly prime, because it can be changed into another prime (964405637527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 482202818760 + 482202818761.

It is an arithmetic number, because the mean of its divisors is an integer number (482202818761).

Almost surely, 2^964405637521 is an apocalyptic number.

It is an amenable number.

964405637521 is a deficient number, since it is larger than the sum of its proper divisors (1).

964405637521 is an equidigital number, since it uses as much as digits as its factorization.

964405637521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5443200, while the sum is 52.

The spelling of 964405637521 in words is "nine hundred sixty-four billion, four hundred five million, six hundred thirty-seven thousand, five hundred twenty-one".