166601725 has 6 divisors (see below), whose sum is σ = 206586170. Its totient is φ = 133281360.

The previous prime is 166601711. The next prime is 166601741. The reversal of 166601725 is 527106661.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 30669444 + 135932281 = 5538^2 + 11659^2 .

It is not a de Polignac number, because 166601725 - 2¹⁷ = 166470653 is a prime.

It is a super-2 number, since 2×166601725² = 55512269545951250, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3332010 + ... + 3332059.

Almost surely, 2^166601725 is an apocalyptic number.

It is an amenable number.

166601725 is a deficient number, since it is larger than the sum of its proper divisors (39984445).

166601725 is an equidigital number, since it uses as much as digits as its factorization.

166601725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6664079 (or 6664074 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 166601725 is about 12907.4290623656. The cubic root of 166601725 is about 550.2497213104.

The spelling of 166601725 in words is "one hundred sixty-six million, six hundred one thousand, seven hundred twenty-five".