664311654 has 12 divisors (see below), whose sum is σ = 1439341956. Its totient is φ = 221437212.

The previous prime is 664311623. The next prime is 664311667. The reversal of 664311654 is 456113466.

It is a happy number.

664311654 is a `hidden beast` number, since 6 + 643 + 1 + 1 + 6 + 5 + 4 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18453084 + ... + 18453119.

It is an arithmetic number, because the mean of its divisors is an integer number (119945163).

Almost surely, 2^664311654 is an apocalyptic number.

664311654 is an abundant number, since it is smaller than the sum of its proper divisors (775030302).

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

664311654 is a wasteful number, since it uses less digits than its factorization.

664311654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36906211 (or 36906208 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 664311654 is about 25774.2440044320. The cubic root of 664311654 is about 872.5506045859.

The spelling of 664311654 in words is "six hundred sixty-four million, three hundred eleven thousand, six hundred fifty-four".