66634018905888 has 192 divisors, whose sum is σ = 226839214264320. Its totient is φ = 18633221012736.

The previous prime is 66634018905877. The next prime is 66634018905919. The reversal of 66634018905888 is 88850981043666.

It is a happy number.

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 31 ways as a sum of consecutive naturals, for example, 116923506 + ... + 117492017.

It is an arithmetic number, because the mean of its divisors is an integer number (1181454240960).

Almost surely, 2^{66634018905888} is an apocalyptic number.

It is an amenable number.

66634018905888 is an abundant number, since it is smaller than the sum of its proper divisors (160205195358432).

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

66634018905888 is a wasteful number, since it uses less digits than its factorization.

66634018905888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234415596 (or 234415582 counting only the distinct ones).

The product of its (nonzero) digits is 477757440, while the sum is 72.

The spelling of 66634018905888 in words is "sixty-six trillion, six hundred thirty-four billion, eighteen million, nine hundred five thousand, eight hundred eighty-eight".