664033818 has 32 divisors (see below), whose sum is σ = 1523297664. Its totient is φ = 189035712.

The previous prime is 664033757. The next prime is 664033823. The reversal of 664033818 is 818330466.

It is a super-2 number, since 2×664033818² = 881881822895314248, which contains 22 as substring.

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, 16905 + ... + 40172.

It is an arithmetic number, because the mean of its divisors is an integer number (47603052).

Almost surely, 2^664033818 is an apocalyptic number.

664033818 is an abundant number, since it is smaller than the sum of its proper divisors (859263846).

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

664033818 is a wasteful number, since it uses less digits than its factorization.

664033818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57366.

The product of its (nonzero) digits is 82944, while the sum is 39.

The square root of 664033818 is about 25768.8536415573. The cubic root of 664033818 is about 872.4289449337.

The spelling of 664033818 in words is "six hundred sixty-four million, thirty-three thousand, eight hundred eighteen".