66712564 has 12 divisors (see below), whose sum is σ = 116809924. Its totient is φ = 33338304.

The previous prime is 66712559. The next prime is 66712603. The reversal of 66712564 is 46521766.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 61152400 + 5560164 = 7820^2 + 2358^2 .

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7282 + ... + 13654.

Almost surely, 2^66712564 is an apocalyptic number.

It is an amenable number.

66712564 is a deficient number, since it is larger than the sum of its proper divisors (50097360).

66712564 is a wasteful number, since it uses less digits than its factorization.

66712564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8994 (or 8992 counting only the distinct ones).

The product of its digits is 60480, while the sum is 37.

The square root of 66712564 is about 8167.7759518733. The cubic root of 66712564 is about 405.5731639763.

It can be divided in two parts, 66712 and 564, that added together give a palindrome (67276).

The spelling of 66712564 in words is "sixty-six million, seven hundred twelve thousand, five hundred sixty-four".