166657225 has 24 divisors (see below), whose sum is σ = 236744768. Its totient is φ = 114004800.

The previous prime is 166657201. The next prime is 166657261. The reversal of 166657225 is 522756661.

It is not a de Polignac number, because 166657225 - 2⁷ = 166657097 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 94855 + ... + 96595.

Almost surely, 2^166657225 is an apocalyptic number.

It is an amenable number.

166657225 is a deficient number, since it is larger than the sum of its proper divisors (70087543).

166657225 is a wasteful number, since it uses less digits than its factorization.

166657225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2305 (or 2300 counting only the distinct ones).

The product of its digits is 151200, while the sum is 40.

The square root of 166657225 is about 12909.5788080014. The cubic root of 166657225 is about 550.3108160541.

The spelling of 166657225 in words is "one hundred sixty-six million, six hundred fifty-seven thousand, two hundred twenty-five".