664156224 has 42 divisors (see below), whose sum is σ = 1903685550. Its totient is φ = 221385216.

The previous prime is 664156219. The next prime is 664156237. The reversal of 664156224 is 422651466.

664156224 is a `hidden beast` number, since 6 + 641 + 5 + 6 + 2 + 2 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 426009600 + 238146624 = 20640^2 + 15432^2 .

It is a super-2 number, since 2×664156224² = 882206979755876352, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 575949 + ... + 577100.

Almost surely, 2^664156224 is an apocalyptic number.

664156224 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

664156224 is an abundant number, since it is smaller than the sum of its proper divisors (1239529326).

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

664156224 is a wasteful number, since it uses less digits than its factorization.

664156224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1153067 (or 1153054 counting only the distinct ones).

The product of its digits is 69120, while the sum is 36.

The square root of 664156224 is about 25771.2286086636. The cubic root of 664156224 is about 872.4825486174.

The spelling of 664156224 in words is "six hundred sixty-four million, one hundred fifty-six thousand, two hundred twenty-four".