66917366880 has 192 divisors, whose sum is σ = 259433653248. Its totient is φ = 14118819840.

The previous prime is 66917366869. The next prime is 66917366911. The reversal of 66917366880 is 8866371966.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 722316 + ... + 809675.

It is an arithmetic number, because the mean of its divisors is an integer number (1351216944).

Almost surely, 2^66917366880 is an apocalyptic number.

66917366880 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66917366880 is an abundant number, since it is smaller than the sum of its proper divisors (192516286368).

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

66917366880 is a wasteful number, since it uses less digits than its factorization.

66917366880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1532029 (or 1532021 counting only the distinct ones).

The product of its (nonzero) digits is 15676416, while the sum is 60.

The spelling of 66917366880 in words is "sixty-six billion, nine hundred seventeen million, three hundred sixty-six thousand, eight hundred eighty".