166851864588 has 72 divisors (see below), whose sum is σ = 427830656400. Its totient is φ = 50540628992.

The previous prime is 166851864563. The next prime is 166851864589. The reversal of 166851864588 is 885468158661.

It is a Smith number, since the sum of its digits (66) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (166851864589) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 728943 + ... + 930086.

It is an arithmetic number, because the mean of its divisors is an integer number (5942092450).

Almost surely, 2^166851864588 is an apocalyptic number.

It is an amenable number.

166851864588 is an abundant number, since it is smaller than the sum of its proper divisors (260978791812).

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

166851864588 is a wasteful number, since it uses less digits than its factorization.

166851864588 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1659099 (or 1659080 counting only the distinct ones).

The product of its digits is 88473600, while the sum is 66.

The spelling of 166851864588 in words is "one hundred sixty-six billion, eight hundred fifty-one million, eight hundred sixty-four thousand, five hundred eighty-eight".