166685168500 has 24 divisors (see below), whose sum is σ = 364040409096. Its totient is φ = 66674067200.

The previous prime is 166685168483. The next prime is 166685168501. The reversal of 166685168500 is 5861586661.

It can be written as a sum of positive squares in 4 ways, for example, as 542517264 + 166142651236 = 23292^2 + 407606^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166685168501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166684669 + ... + 166685668.

It is an arithmetic number, because the mean of its divisors is an integer number (15168350379).

Almost surely, 2^166685168500 is an apocalyptic number.

166685168500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166685168500 is an abundant number, since it is smaller than the sum of its proper divisors (197355240596).

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

166685168500 is a wasteful number, since it uses less digits than its factorization.

166685168500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333370356 (or 333370344 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 52.

The spelling of 166685168500 in words is "one hundred sixty-six billion, six hundred eighty-five million, one hundred sixty-eight thousand, five hundred".