664165224 has 64 divisors (see below), whose sum is σ = 1848873600. Its totient is φ = 220912128.

The previous prime is 664165219. The next prime is 664165241. The reversal of 664165224 is 422561466.

664165224 is a `hidden beast` number, since 6 + 641 + 6 + 5 + 2 + 2 + 4 = 666.

It is a super-2 number, since 2×664165224² = 882230889541940352, 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 15 ways as a sum of consecutive naturals, for example, 105592 + ... + 111704.

It is an arithmetic number, because the mean of its divisors is an integer number (28888650).

Almost surely, 2^664165224 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664165224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (924436800).

664165224 is an abundant number, since it is smaller than the sum of its proper divisors (1184708376).

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

664165224 is a wasteful number, since it uses less digits than its factorization.

664165224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6631 (or 6621 counting only the distinct ones).

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

The square root of 664165224 is about 25771.4032214003. The cubic root of 664165224 is about 872.4864896116.

The spelling of 664165224 in words is "six hundred sixty-four million, one hundred sixty-five thousand, two hundred twenty-four".