66680868 has 24 divisors (see below), whose sum is σ = 164741472. Its totient is φ = 20919424.

The previous prime is 66680863. The next prime is 66680891. The reversal of 66680868 is 86808666.

It is not an unprimeable number, because it can be changed into a prime (66680863) 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, 163230 + ... + 163637.

It is an arithmetic number, because the mean of its divisors is an integer number (6864228).

Almost surely, 2^66680868 is an apocalyptic number.

66680868 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

66680868 is an abundant number, since it is smaller than the sum of its proper divisors (98060604).

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

66680868 is a wasteful number, since it uses less digits than its factorization.

66680868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326891 (or 326889 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 48.

The square root of 66680868 is about 8165.8354134773. The cubic root of 66680868 is about 405.5089227867.

The spelling of 66680868 in words is "sixty-six million, six hundred eighty thousand, eight hundred sixty-eight".