66994188 has 24 divisors (see below), whose sum is σ = 157066560. Its totient is φ = 22224720.

The previous prime is 66994177. The next prime is 66994199. The reversal of 66994188 is 88149966.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (66994177) and next prime (66994199).

It is a self number, because there is not a number n which added to its sum of digits gives 66994188.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10698 + ... + 15761.

It is an arithmetic number, because the mean of its divisors is an integer number (6544440).

Almost surely, 2^66994188 is an apocalyptic number.

It is an amenable number.

66994188 is an abundant number, since it is smaller than the sum of its proper divisors (90072372).

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

66994188 is a wasteful number, since it uses less digits than its factorization.

66994188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26677 (or 26675 counting only the distinct ones).

The product of its digits is 746496, while the sum is 51.

The square root of 66994188 is about 8184.9977397676. The cubic root of 66994188 is about 406.1430655669.

The spelling of 66994188 in words is "sixty-six million, nine hundred ninety-four thousand, one hundred eighty-eight".