166331251 has 2 divisors, whose sum is σ = 166331252. Its totient is φ = 166331250.

The previous prime is 166331227. The next prime is 166331257. The reversal of 166331251 is 152133661.

166331251 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 166331251 - 2²³ = 157942643 is a prime.

It is not a weakly prime, because it can be changed into another prime (166331257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83165625 + 83165626.

It is an arithmetic number, because the mean of its divisors is an integer number (83165626).

Almost surely, 2^166331251 is an apocalyptic number.

166331251 is a deficient number, since it is larger than the sum of its proper divisors (1).

166331251 is an equidigital number, since it uses as much as digits as its factorization.

166331251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3240, while the sum is 28.

The square root of 166331251 is about 12896.9473519899. The cubic root of 166331251 is about 549.9517875094.

The spelling of 166331251 in words is "one hundred sixty-six million, three hundred thirty-one thousand, two hundred fifty-one".