66626838864 has 60 divisors (see below), whose sum is σ = 187804125600. Its totient is φ = 22049163072.

The previous prime is 66626838857. The next prime is 66626838881. The reversal of 66626838864 is 46883862666.

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 polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1644324 + ... + 1684355.

It is an arithmetic number, because the mean of its divisors is an integer number (3130068760).

Almost surely, 2^66626838864 is an apocalyptic number.

It is an amenable number.

66626838864 is an abundant number, since it is smaller than the sum of its proper divisors (121177286736).

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

66626838864 is a wasteful number, since it uses less digits than its factorization.

66626838864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3328832 (or 3328823 counting only the distinct ones).

The product of its digits is 95551488, while the sum is 63.

The spelling of 66626838864 in words is "sixty-six billion, six hundred twenty-six million, eight hundred thirty-eight thousand, eight hundred sixty-four".