66646612 has 12 divisors (see below), whose sum is σ = 118108480. Its totient is φ = 32901336.

The previous prime is 66646561. The next prime is 66646627. The reversal of 66646612 is 21664666.

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105138 + ... + 105769.

Almost surely, 2^66646612 is an apocalyptic number.

It is an amenable number.

66646612 is a deficient number, since it is larger than the sum of its proper divisors (51461868).

66646612 is a wasteful number, since it uses less digits than its factorization.

66646612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210990 (or 210988 counting only the distinct ones).

The product of its digits is 62208, while the sum is 37.

The square root of 66646612 is about 8163.7376243973. The cubic root of 66646612 is about 405.4394701160.

It can be divided in two parts, 666 and 46612, that added together give a triangular number (47278 = T₃₀₇).

The spelling of 66646612 in words is "sixty-six million, six hundred forty-six thousand, six hundred twelve".