166406257 has 2 divisors, whose sum is σ = 166406258. Its totient is φ = 166406256.

The previous prime is 166406243. The next prime is 166406299. The reversal of 166406257 is 752604661.

It is a happy number.

166406257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 155850256 + 10556001 = 12484^2 + 3249^2 .

It is a cyclic number.

It is not a de Polignac number, because 166406257 - 2⁷ = 166406129 is a prime.

It is not a weakly prime, because it can be changed into another prime (166407257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83203128 + 83203129.

It is an arithmetic number, because the mean of its divisors is an integer number (83203129).

Almost surely, 2^166406257 is an apocalyptic number.

It is an amenable number.

166406257 is a deficient number, since it is larger than the sum of its proper divisors (1).

166406257 is an equidigital number, since it uses as much as digits as its factorization.

166406257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 166406257 is about 12899.8549216648. The cubic root of 166406257 is about 550.0344408185.

The spelling of 166406257 in words is "one hundred sixty-six million, four hundred six thousand, two hundred fifty-seven".