66718992 has 40 divisors (see below), whose sum is σ = 177020416. Its totient is φ = 21638016.

The previous prime is 66718987. The next prime is 66719017. The reversal of 66718992 is 29981766.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

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, 17008 + ... + 20559.

Almost surely, 2^66718992 is an apocalyptic number.

It is an amenable number.

66718992 is an abundant number, since it is smaller than the sum of its proper divisors (110301424).

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

66718992 is a wasteful number, since it uses less digits than its factorization.

66718992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37615 (or 37609 counting only the distinct ones).

The product of its digits is 326592, while the sum is 48.

The square root of 66718992 is about 8168.1694399663. The cubic root of 66718992 is about 405.5861897114.

The spelling of 66718992 in words is "sixty-six million, seven hundred eighteen thousand, nine hundred ninety-two".