664166536 has 32 divisors (see below), whose sum is σ = 1380804480. Its totient is φ = 296942400.

The previous prime is 664166521. The next prime is 664166567. The reversal of 664166536 is 635661466.

It is a super-2 number, since 2×664166536² = 882234375084478592, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 664166492 and 664166501.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56496 + ... + 67231.

It is an arithmetic number, because the mean of its divisors is an integer number (43150140).

Almost surely, 2^664166536 is an apocalyptic number.

It is an amenable number.

664166536 is an abundant number, since it is smaller than the sum of its proper divisors (716637944).

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

664166536 is a wasteful number, since it uses less digits than its factorization.

664166536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123805 (or 123801 counting only the distinct ones).

The product of its digits is 466560, while the sum is 43.

The square root of 664166536 is about 25771.4286759582. The cubic root of 664166536 is about 872.4870641180.

The spelling of 664166536 in words is "six hundred sixty-four million, one hundred sixty-six thousand, five hundred thirty-six".