66788580215808 has 176 divisors, whose sum is σ = 215776869198720. Its totient is φ = 20238963609600.

The previous prime is 66788580215783. The next prime is 66788580215837. The reversal of 66788580215808 is 80851208588766.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (176).

It is a Harshad number since it is a multiple of its sum of digits (72).

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, 109499278 + ... + 110107533.

Almost surely, 2^{66788580215808} is an apocalyptic number.

It is an amenable number.

66788580215808 is an abundant number, since it is smaller than the sum of its proper divisors (148988288982912).

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

66788580215808 is a wasteful number, since it uses less digits than its factorization.

66788580215808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219606851 (or 219606827 counting only the distinct ones).

The product of its (nonzero) digits is 412876800, while the sum is 72.

The spelling of 66788580215808 in words is "sixty-six trillion, seven hundred eighty-eight billion, five hundred eighty million, two hundred fifteen thousand, eight hundred eight".