166051251 has 24 divisors (see below), whose sum is σ = 246474800. Its totient is φ = 107666496.

The previous prime is 166051247. The next prime is 166051253. The reversal of 166051251 is 152150661.

It is a happy number.

166051251 is a `hidden beast` number, since 1 + 6 + 605 + 1 + 2 + 51 = 666.

It is not a de Polignac number, because 166051251 - 2² = 166051247 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166051253) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 106425 + ... + 107973.

Almost surely, 2^166051251 is an apocalyptic number.

166051251 is a deficient number, since it is larger than the sum of its proper divisors (80423549).

166051251 is a wasteful number, since it uses less digits than its factorization.

166051251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1875 (or 1872 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 166051251 is about 12886.0874977628. The cubic root of 166051251 is about 549.6430201415.

The spelling of 166051251 in words is "one hundred sixty-six million, fifty-one thousand, two hundred fifty-one".