166257617 has 2 divisors, whose sum is σ = 166257618. Its totient is φ = 166257616.

The previous prime is 166257601. The next prime is 166257653. The reversal of 166257617 is 716752661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83156161 + 83101456 = 9119^2 + 9116^2 .

It is a cyclic number.

It is not a de Polignac number, because 166257617 - 2⁴ = 166257601 is a prime.

It is not a weakly prime, because it can be changed into another prime (166257697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83128808 + 83128809.

It is an arithmetic number, because the mean of its divisors is an integer number (83128809).

Almost surely, 2^166257617 is an apocalyptic number.

It is an amenable number.

166257617 is a deficient number, since it is larger than the sum of its proper divisors (1).

166257617 is an equidigital number, since it uses as much as digits as its factorization.

166257617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 105840, while the sum is 41.

The square root of 166257617 is about 12894.0923294352. The cubic root of 166257617 is about 549.8706219100.

It can be divided in two parts, 16625 and 7617, that added together give a palindrome (24242).

The spelling of 166257617 in words is "one hundred sixty-six million, two hundred fifty-seven thousand, six hundred seventeen".