66661612 has 6 divisors (see below), whose sum is σ = 116657828. Its totient is φ = 33330804.

The previous prime is 66661591. The next prime is 66661619. The reversal of 66661612 is 21616666.

It is not an unprimeable number, because it can be changed into a prime (66661619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8332698 + ... + 8332705.

Almost surely, 2^66661612 is an apocalyptic number.

It is an amenable number.

66661612 is a deficient number, since it is larger than the sum of its proper divisors (49996216).

66661612 is a wasteful number, since it uses less digits than its factorization.

66661612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16665407 (or 16665405 counting only the distinct ones).

The product of its digits is 15552, while the sum is 34.

The square root of 66661612 is about 8164.6562695560. The cubic root of 66661612 is about 405.4698849447.

The spelling of 66661612 in words is "sixty-six million, six hundred sixty-one thousand, six hundred twelve".