166660425 has 18 divisors (see below), whose sum is σ = 298507742. Its totient is φ = 88885440.

The previous prime is 166660411. The next prime is 166660447. The reversal of 166660425 is 524066661.

It is a happy number.

166660425 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 34433424 + 132227001 = 5868^2 + 11499^2 .

It is not a de Polignac number, because 166660425 - 2²² = 162466121 is a prime.

It is a super-2 number, since 2×166660425² = 55551394522361250, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166660425.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 370132 + ... + 370581.

Almost surely, 2^166660425 is an apocalyptic number.

166660425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

166660425 is a deficient number, since it is larger than the sum of its proper divisors (131847317).

166660425 is a wasteful number, since it uses less digits than its factorization.

166660425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 740729 (or 740721 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 166660425 is about 12909.7027463842. The cubic root of 166660425 is about 550.3143382203.

The spelling of 166660425 in words is "one hundred sixty-six million, six hundred sixty thousand, four hundred twenty-five".