66981120 has 72 divisors (see below), whose sum is σ = 213933216. Its totient is φ = 17860608.

The previous prime is 66981073. The next prime is 66981151. The reversal of 66981120 is 2118966.

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, 4882 + ... + 12561.

Almost surely, 2^66981120 is an apocalyptic number.

66981120 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66981120 is an abundant number, since it is smaller than the sum of its proper divisors (146952096).

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

66981120 is a wasteful number, since it uses less digits than its factorization.

66981120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17467 (or 17453 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 66981120 is about 8184.1994110603. The cubic root of 66981120 is about 406.1166561978.

The spelling of 66981120 in words is "sixty-six million, nine hundred eighty-one thousand, one hundred twenty".