66368805918 has 32 divisors (see below), whose sum is σ = 134161767936. Its totient is φ = 21885765888.

The previous prime is 66368805743. The next prime is 66368805941. The reversal of 66368805918 is 81950886366.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1457605 + ... + 1502447.

It is an arithmetic number, because the mean of its divisors is an integer number (4192555248).

Almost surely, 2^66368805918 is an apocalyptic number.

66368805918 is an abundant number, since it is smaller than the sum of its proper divisors (67792962018).

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

66368805918 is a wasteful number, since it uses less digits than its factorization.

66368805918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47488.

The product of its (nonzero) digits is 14929920, while the sum is 60.

The spelling of 66368805918 in words is "sixty-six billion, three hundred sixty-eight million, eight hundred five thousand, nine hundred eighteen".