166685928975 has 36 divisors (see below), whose sum is σ = 309610549976. Its totient is φ = 88899158880.

The previous prime is 166685928911. The next prime is 166685929057. The reversal of 166685928975 is 579829586661.

It is not a de Polignac number, because 166685928975 - 2⁶ = 166685928911 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 13712932 + ... + 13725081.

Almost surely, 2^166685928975 is an apocalyptic number.

166685928975 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

166685928975 is a deficient number, since it is larger than the sum of its proper divisors (142924621001).

166685928975 is an equidigital number, since it uses as much as digits as its factorization.

166685928975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27438038 (or 27438021 counting only the distinct ones).

The product of its digits is 391910400, while the sum is 72.

The spelling of 166685928975 in words is "one hundred sixty-six billion, six hundred eighty-five million, nine hundred twenty-eight thousand, nine hundred seventy-five".