166155617 has 2 divisors, whose sum is σ = 166155618. Its totient is φ = 166155616.

The previous prime is 166155607. The next prime is 166155653. The reversal of 166155617 is 716551661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 164070481 + 2085136 = 12809^2 + 1444^2 .

It is a cyclic number.

It is not a de Polignac number, because 166155617 - 2¹² = 166151521 is a prime.

It is not a weakly prime, because it can be changed into another prime (166155607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83077808 + 83077809.

It is an arithmetic number, because the mean of its divisors is an integer number (83077809).

Almost surely, 2^166155617 is an apocalyptic number.

It is an amenable number.

166155617 is a deficient number, since it is larger than the sum of its proper divisors (1).

166155617 is an equidigital number, since it uses as much as digits as its factorization.

166155617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37800, while the sum is 38.

The square root of 166155617 is about 12890.1364228622. The cubic root of 166155617 is about 549.7581493143.

The spelling of 166155617 in words is "one hundred sixty-six million, one hundred fifty-five thousand, six hundred seventeen".