64465521 has 16 divisors (see below), whose sum is σ = 89846400. Its totient is φ = 41061888.

The previous prime is 64465451. The next prime is 64465589. The reversal of 64465521 is 12556446.

It is not a de Polignac number, because 64465521 - 2⁷ = 64465393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64465321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4620 + ... + 12258.

It is an arithmetic number, because the mean of its divisors is an integer number (5615400).

Almost surely, 2^64465521 is an apocalyptic number.

It is an amenable number.

64465521 is a deficient number, since it is larger than the sum of its proper divisors (25380879).

64465521 is a wasteful number, since it uses less digits than its factorization.

64465521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7768.

The product of its digits is 28800, while the sum is 33.

The square root of 64465521 is about 8029.0423463823. The cubic root of 64465521 is about 400.9674934212.

The spelling of 64465521 in words is "sixty-four million, four hundred sixty-five thousand, five hundred twenty-one".