166225957 has 2 divisors, whose sum is σ = 166225958. Its totient is φ = 166225956.

The previous prime is 166225921. The next prime is 166225979. The reversal of 166225957 is 759522661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117700801 + 48525156 = 10849^2 + 6966^2 .

It is a cyclic number.

It is not a de Polignac number, because 166225957 - 2²³ = 157837349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166225757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83112978 + 83112979.

It is an arithmetic number, because the mean of its divisors is an integer number (83112979).

Almost surely, 2^166225957 is an apocalyptic number.

It is an amenable number.

166225957 is a deficient number, since it is larger than the sum of its proper divisors (1).

166225957 is an equidigital number, since it uses as much as digits as its factorization.

166225957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 226800, while the sum is 43.

The square root of 166225957 is about 12892.8645769666. The cubic root of 166225957 is about 549.8357162229.

The spelling of 166225957 in words is "one hundred sixty-six million, two hundred twenty-five thousand, nine hundred fifty-seven".