66626512 has 20 divisors (see below), whose sum is σ = 131526180. Its totient is φ = 32684288.

The previous prime is 66626503. The next prime is 66626513. The reversal of 66626512 is 21562666.

It can be written as a sum of positive squares in 2 ways, for example, as 59845696 + 6780816 = 7736^2 + 2604^2 .

It is a super-2 number, since 2×66626512² = 8878184202572288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66626513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38437 + ... + 40132.

It is an arithmetic number, because the mean of its divisors is an integer number (6576309).

Almost surely, 2^66626512 is an apocalyptic number.

It is an amenable number.

66626512 is a deficient number, since it is larger than the sum of its proper divisors (64899668).

66626512 is a wasteful number, since it uses less digits than its factorization.

66626512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78630 (or 78624 counting only the distinct ones).

The product of its digits is 25920, while the sum is 34.

The square root of 66626512 is about 8162.5064777922. The cubic root of 66626512 is about 405.3987070900.

The spelling of 66626512 in words is "sixty-six million, six hundred twenty-six thousand, five hundred twelve".