664154556 has 48 divisors (see below), whose sum is σ = 1704428544. Its totient is φ = 200005056.

The previous prime is 664154539. The next prime is 664154567. The reversal of 664154556 is 655451466.

It is a super-2 number, since 2×664154556² = 882202548511114272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37960 + ... + 52623.

It is an arithmetic number, because the mean of its divisors is an integer number (35508928).

Almost surely, 2^664154556 is an apocalyptic number.

It is an amenable number.

664154556 is an abundant number, since it is smaller than the sum of its proper divisors (1040273988).

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

664154556 is a wasteful number, since it uses less digits than its factorization.

664154556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90650 (or 90648 counting only the distinct ones).

The product of its digits is 432000, while the sum is 42.

The square root of 664154556 is about 25771.1962469731. The cubic root of 664154556 is about 872.4818182159.

The spelling of 664154556 in words is "six hundred sixty-four million, one hundred fifty-four thousand, five hundred fifty-six".