66866680 has 32 divisors (see below), whose sum is σ = 150757200. Its totient is φ = 26692096.

The previous prime is 66866671. The next prime is 66866693. The reversal of 66866680 is 8666866.

It is a self number, because there is not a number n which added to its sum of digits gives 66866680.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22311 + ... + 25129.

Almost surely, 2^66866680 is an apocalyptic number.

It is an amenable number.

66866680 is an abundant number, since it is smaller than the sum of its proper divisors (83890520).

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

66866680 is a wasteful number, since it uses less digits than its factorization.

66866680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3423 (or 3419 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 46.

The square root of 66866680 is about 8177.2049014318. The cubic root of 66866680 is about 405.8852353437.

It can be divided in two parts, 668666 and 80, that added together give a triangular number (668746 = T₁₁₅₆).

The spelling of 66866680 in words is "sixty-six million, eight hundred sixty-six thousand, six hundred eighty".