166116725 has 12 divisors (see below), whose sum is σ = 209363460. Its totient is φ = 130713600.

The previous prime is 166116719. The next prime is 166116733. The reversal of 166116725 is 527611661.

It can be written as a sum of positive squares in 6 ways, for example, as 40475044 + 125641681 = 6362^2 + 11209^2 .

It is not a de Polignac number, because 166116725 - 2¹² = 166112629 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52940 + ... + 55989.

It is an arithmetic number, because the mean of its divisors is an integer number (17446955).

Almost surely, 2^166116725 is an apocalyptic number.

It is an amenable number.

166116725 is a deficient number, since it is larger than the sum of its proper divisors (43246735).

166116725 is a wasteful number, since it uses less digits than its factorization.

166116725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109000 (or 108995 counting only the distinct ones).

The product of its digits is 15120, while the sum is 35.

The square root of 166116725 is about 12888.6277392126. The cubic root of 166116725 is about 549.7152520538.

The spelling of 166116725 in words is "one hundred sixty-six million, one hundred sixteen thousand, seven hundred twenty-five".