166722151 has 2 divisors, whose sum is σ = 166722152. Its totient is φ = 166722150.

The previous prime is 166722109. The next prime is 166722161. The reversal of 166722151 is 151227661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 166722151 - 2²⁵ = 133167719 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166722161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83361075 + 83361076.

It is an arithmetic number, because the mean of its divisors is an integer number (83361076).

Almost surely, 2^166722151 is an apocalyptic number.

166722151 is a deficient number, since it is larger than the sum of its proper divisors (1).

166722151 is an equidigital number, since it uses as much as digits as its factorization.

166722151 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040, while the sum is 31.

The square root of 166722151 is about 12912.0932075322. The cubic root of 166722151 is about 550.3822697844.

The spelling of 166722151 in words is "one hundred sixty-six million, seven hundred twenty-two thousand, one hundred fifty-one".