166655617 has 4 divisors (see below), whose sum is σ = 168663600. Its totient is φ = 164647636.

The previous prime is 166655581. The next prime is 166655627. The reversal of 166655617 is 716556661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166655617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166655627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1003867 + ... + 1004032.

It is an arithmetic number, because the mean of its divisors is an integer number (42165900).

Almost surely, 2^166655617 is an apocalyptic number.

It is an amenable number.

166655617 is a deficient number, since it is larger than the sum of its proper divisors (2007983).

166655617 is an equidigital number, since it uses as much as digits as its factorization.

166655617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2007982.

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

The square root of 166655617 is about 12909.5165285149. The cubic root of 166655617 is about 550.3090461485.

The spelling of 166655617 in words is "one hundred sixty-six million, six hundred fifty-five thousand, six hundred seventeen".