66621828864 has 36 divisors (see below), whose sum is σ = 177311223656. Its totient is φ = 22207276032.

The previous prime is 66621828841. The next prime is 66621828883. The reversal of 66621828864 is 46882812666.

It is a nude number because it is divisible by every one of its digits.

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 3 ways as a sum of consecutive naturals, for example, 43372819 + ... + 43374354.

Almost surely, 2^66621828864 is an apocalyptic number.

66621828864 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

66621828864 is an abundant number, since it is smaller than the sum of its proper divisors (110689394792).

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

66621828864 is an equidigital number, since it uses as much as digits as its factorization.

66621828864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86747192 (or 86747178 counting only the distinct ones).

The product of its digits is 10616832, while the sum is 57.

The spelling of 66621828864 in words is "sixty-six billion, six hundred twenty-one million, eight hundred twenty-eight thousand, eight hundred sixty-four".