664562656 has 12 divisors (see below), whose sum is σ = 1308357792. Its totient is φ = 332281312.

The previous prime is 664562653. The next prime is 664562669. The reversal of 664562656 is 656265466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664562651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10383760 + ... + 10383823.

It is an arithmetic number, because the mean of its divisors is an integer number (109029816).

Almost surely, 2^664562656 is an apocalyptic number.

It is an amenable number.

664562656 is a deficient number, since it is larger than the sum of its proper divisors (643795136).

664562656 is a wasteful number, since it uses less digits than its factorization.

664562656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20767593 (or 20767585 counting only the distinct ones).

The product of its digits is 1555200, while the sum is 46.

The square root of 664562656 is about 25779.1127853540. The cubic root of 664562656 is about 872.6604849248.

The spelling of 664562656 in words is "six hundred sixty-four million, five hundred sixty-two thousand, six hundred fifty-six".