166632251 has 4 divisors (see below), whose sum is σ = 168741600. Its totient is φ = 164522904.

The previous prime is 166632239. The next prime is 166632259. The reversal of 166632251 is 152236661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 166632251 - 2⁶ = 166632187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166632259) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1054556 + ... + 1054713.

It is an arithmetic number, because the mean of its divisors is an integer number (42185400).

Almost surely, 2^166632251 is an apocalyptic number.

166632251 is a deficient number, since it is larger than the sum of its proper divisors (2109349).

166632251 is an equidigital number, since it uses as much as digits as its factorization.

166632251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2109348.

The product of its digits is 12960, while the sum is 32.

The square root of 166632251 is about 12908.6115055028. The cubic root of 166632251 is about 550.2833261990.

The spelling of 166632251 in words is "one hundred sixty-six million, six hundred thirty-two thousand, two hundred fifty-one".