664047066 has 16 divisors (see below), whose sum is σ = 1363989024. Its totient is φ = 215366544.

The previous prime is 664047011. The next prime is 664047073. The reversal of 664047066 is 660740466.

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, 1495380 + ... + 1495823.

It is an arithmetic number, because the mean of its divisors is an integer number (85249314).

Almost surely, 2^664047066 is an apocalyptic number.

664047066 is an abundant number, since it is smaller than the sum of its proper divisors (699941958).

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

664047066 is a wasteful number, since it uses less digits than its factorization.

664047066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2991245.

The product of its (nonzero) digits is 145152, while the sum is 39.

The square root of 664047066 is about 25769.1106947834. The cubic root of 664047066 is about 872.4347467777.

The spelling of 664047066 in words is "six hundred sixty-four million, forty-seven thousand, sixty-six".