64166660 has 12 divisors (see below), whose sum is σ = 134750028. Its totient is φ = 25666656.

The previous prime is 64166657. The next prime is 64166741. The reversal of 64166660 is 6666146.

It can be written as a sum of positive squares in 2 ways, for example, as 34833604 + 29333056 = 5902^2 + 5416^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 64166660.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1604147 + ... + 1604186.

It is an arithmetic number, because the mean of its divisors is an integer number (11229169).

Almost surely, 2^64166660 is an apocalyptic number.

It is an amenable number.

64166660 is an abundant number, since it is smaller than the sum of its proper divisors (70583368).

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

64166660 is a wasteful number, since it uses less digits than its factorization.

64166660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3208342 (or 3208340 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 64166660 is about 8010.4094776734. The cubic root of 64166660 is about 400.3469073845.

The spelling of 64166660 in words is "sixty-four million, one hundred sixty-six thousand, six hundred sixty".