664526560 has 24 divisors (see below), whose sum is σ = 1569944376. Its totient is φ = 265810560.

The previous prime is 664526543. The next prime is 664526563. The reversal of 664526560 is 65625466.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664526563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2076486 + ... + 2076805.

It is an arithmetic number, because the mean of its divisors is an integer number (65414349).

Almost surely, 2^664526560 is an apocalyptic number.

It is an amenable number.

664526560 is an abundant number, since it is smaller than the sum of its proper divisors (905417816).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664526560 is a wasteful number, since it uses less digits than its factorization.

664526560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4153306 (or 4153298 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 40.

The square root of 664526560 is about 25778.4126741737. The cubic root of 664526560 is about 872.6446849984.

The spelling of 664526560 in words is "six hundred sixty-four million, five hundred twenty-six thousand, five hundred sixty".