66941880 has 64 divisors (see below), whose sum is σ = 206267040. Its totient is φ = 17367552.

The previous prime is 66941873. The next prime is 66941893. The reversal of 66941880 is 8814966.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3099 + ... + 11978.

Almost surely, 2^66941880 is an apocalyptic number.

66941880 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66941880 is an abundant number, since it is smaller than the sum of its proper divisors (139325160).

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

66941880 is a wasteful number, since it uses less digits than its factorization.

66941880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15128 (or 15124 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 42.

The square root of 66941880 is about 8181.8017575593. The cubic root of 66941880 is about 406.0373346886.

The spelling of 66941880 in words is "sixty-six million, nine hundred forty-one thousand, eight hundred eighty".