66571165998 has 24 divisors (see below), whose sum is σ = 144242857200. Its totient is φ = 22189568544.

The previous prime is 66571165987. The next prime is 66571166059. The reversal of 66571165998 is 89956117566.

66571165998 is a `hidden beast` number, since 6 + 6 + 571 + 1 + 6 + 59 + 9 + 8 = 666.

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, 619098 + ... + 718626.

It is an arithmetic number, because the mean of its divisors is an integer number (6010119050).

Almost surely, 2^66571165998 is an apocalyptic number.

66571165998 is an abundant number, since it is smaller than the sum of its proper divisors (77671691202).

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

66571165998 is a wasteful number, since it uses less digits than its factorization.

66571165998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136696 (or 136693 counting only the distinct ones).

The product of its digits is 24494400, while the sum is 63.

The spelling of 66571165998 in words is "sixty-six billion, five hundred seventy-one million, one hundred sixty-five thousand, nine hundred ninety-eight".