66680384 has 28 divisors (see below), whose sum is σ = 134569200. Its totient is φ = 32773248.

The previous prime is 66680377. The next prime is 66680387. The reversal of 66680384 is 48308666.

It is a super-2 number, since 2×66680384² = 8892547220774912, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66680387) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5054 + ... + 12605.

Almost surely, 2^66680384 is an apocalyptic number.

66680384 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

66680384 is an abundant number, since it is smaller than the sum of its proper divisors (67888816).

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

66680384 is a wasteful number, since it uses less digits than its factorization.

66680384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17730 (or 17720 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 41.

The square root of 66680384 is about 8165.8057777540. The cubic root of 66680384 is about 405.5079416617.

The spelling of 66680384 in words is "sixty-six million, six hundred eighty thousand, three hundred eighty-four".