166610401 has 8 divisors (see below), whose sum is σ = 168624680. Its totient is φ = 164602368.

The previous prime is 166610393. The next prime is 166610407. The reversal of 166610401 is 104016661.

It can be written as a sum of positive squares in 4 ways, for example, as 3154176 + 163456225 = 1776^2 + 12785^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 166610401 - 2³ = 166610393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166610407) 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, 72295 + ... + 74563.

It is an arithmetic number, because the mean of its divisors is an integer number (21078085).

Almost surely, 2^166610401 is an apocalyptic number.

It is an amenable number.

166610401 is a deficient number, since it is larger than the sum of its proper divisors (2014279).

166610401 is an equidigital number, since it uses as much as digits as its factorization.

166610401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3123.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 166610401 is about 12907.7651435095. The cubic root of 166610401 is about 550.2592727996.

The spelling of 166610401 in words is "one hundred sixty-six million, six hundred ten thousand, four hundred one".