664565630 has 16 divisors (see below), whose sum is σ = 1214073360. Its totient is φ = 261858432.

The previous prime is 664565599. The next prime is 664565677. The reversal of 664565630 is 36565466.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 495275 + ... + 496614.

It is an arithmetic number, because the mean of its divisors is an integer number (75879585).

Almost surely, 2^664565630 is an apocalyptic number.

664565630 is a deficient number, since it is larger than the sum of its proper divisors (549507730).

664565630 is a wasteful number, since it uses less digits than its factorization.

664565630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 991963.

The product of its (nonzero) digits is 388800, while the sum is 41.

The square root of 664565630 is about 25779.1704676469. The cubic root of 664565630 is about 872.6617866773.

The spelling of 664565630 in words is "six hundred sixty-four million, five hundred sixty-five thousand, six hundred thirty".