664491562 has 16 divisors (see below), whose sum is σ = 1139853312. Its totient is φ = 284600880.

The previous prime is 664491523. The next prime is 664491623. The reversal of 664491562 is 265194466.

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, 9012 + ... + 37552.

It is an arithmetic number, because the mean of its divisors is an integer number (71240832).

Almost surely, 2^664491562 is an apocalyptic number.

664491562 is a deficient number, since it is larger than the sum of its proper divisors (475361750).

664491562 is a wasteful number, since it uses less digits than its factorization.

664491562 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30213.

The product of its digits is 311040, while the sum is 43.

The square root of 664491562 is about 25777.7338414377. The cubic root of 664491562 is about 872.6293651418.

The spelling of 664491562 in words is "six hundred sixty-four million, four hundred ninety-one thousand, five hundred sixty-two".