66655992 has 32 divisors (see below), whose sum is σ = 179459280. Its totient is φ = 20509440.

The previous prime is 66655991. The next prime is 66655999. The reversal of 66655992 is 29955666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66655991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106509 + ... + 107132.

Almost surely, 2^66655992 is an apocalyptic number.

It is an amenable number.

66655992 is an abundant number, since it is smaller than the sum of its proper divisors (112803288).

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

66655992 is a wasteful number, since it uses less digits than its factorization.

66655992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213663 (or 213659 counting only the distinct ones).

The product of its digits is 874800, while the sum is 48.

The square root of 66655992 is about 8164.3120959454. The cubic root of 66655992 is about 405.4584900567.

The spelling of 66655992 in words is "sixty-six million, six hundred fifty-five thousand, nine hundred ninety-two".