666678888900 has 72 divisors (see below), whose sum is σ = 2143249177440. Its totient is φ = 177781036320.

The previous prime is 666678888899. The next prime is 666678888907. The reversal of 666678888900 is 9888876666.

It is not an unprimeable number, because it can be changed into a prime (666678888907) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 123456354 + ... + 123461753.

Almost surely, 2^666678888900 is an apocalyptic number.

666678888900 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

666678888900 is an abundant number, since it is smaller than the sum of its proper divisors (1476570288540).

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

666678888900 is a wasteful number, since it uses less digits than its factorization.

666678888900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246918130 (or 246918117 counting only the distinct ones).

The product of its (nonzero) digits is 334430208, while the sum is 72.

The spelling of 666678888900 in words is "six hundred sixty-six billion, six hundred seventy-eight million, eight hundred eighty-eight thousand, nine hundred".