64612566 has 40 divisors (see below), whose sum is σ = 151083504. Its totient is φ = 20599920.

The previous prime is 64612549. The next prime is 64612567. The reversal of 64612566 is 66521646.

It is a happy number.

64612566 is a `hidden beast` number, since 646 + 1 + 2 + 5 + 6 + 6 = 666.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 64612566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64612567) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4945 + ... + 12396.

Almost surely, 2^64612566 is an apocalyptic number.

64612566 is an abundant number, since it is smaller than the sum of its proper divisors (86470938).

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

64612566 is a wasteful number, since it uses less digits than its factorization.

64612566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17378 (or 17369 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 64612566 is about 8038.1942001920. The cubic root of 64612566 is about 401.2721290966.

The spelling of 64612566 in words is "sixty-four million, six hundred twelve thousand, five hundred sixty-six".