166985001 has 6 divisors (see below), whose sum is σ = 241200570. Its totient is φ = 111323328.

The previous prime is 166984981. The next prime is 166985023. The reversal of 166985001 is 100589661.

166985001 is a `hidden beast` number, since 1 + 66 + 98 + 500 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 142778601 + 24206400 = 11949^2 + 4920^2 .

It is not a de Polignac number, because 166985001 - 2⁵ = 166984969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166985041) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9276936 + ... + 9276953.

It is an arithmetic number, because the mean of its divisors is an integer number (40200095).

Almost surely, 2^166985001 is an apocalyptic number.

It is an amenable number.

166985001 is a deficient number, since it is larger than the sum of its proper divisors (74215569).

166985001 is a wasteful number, since it uses less digits than its factorization.

166985001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18553895 (or 18553892 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 166985001 is about 12922.2676415558. The cubic root of 166985001 is about 550.6713575843.

The spelling of 166985001 in words is "one hundred sixty-six million, nine hundred eighty-five thousand, one".