166639764970 has 48 divisors (see below), whose sum is σ = 351433645920. Its totient is φ = 56722577184.

The previous prime is 166639764931. The next prime is 166639764971. The reversal of 166639764970 is 79467936661.

It is a super-2 number, since 2×166639764970² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (166639764971) 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, 1155204 + ... + 1291423.

It is an arithmetic number, because the mean of its divisors is an integer number (7321534290).

Almost surely, 2^166639764970 is an apocalyptic number.

166639764970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166639764970 is an abundant number, since it is smaller than the sum of its proper divisors (184793880950).

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

166639764970 is a wasteful number, since it uses less digits than its factorization.

166639764970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2446787 (or 2446780 counting only the distinct ones).

The product of its (nonzero) digits is 61725888, while the sum is 64.

The spelling of 166639764970 in words is "one hundred sixty-six billion, six hundred thirty-nine million, seven hundred sixty-four thousand, nine hundred seventy".