161647717 has 12 divisors (see below), whose sum is σ = 205134336. Its totient is φ = 125958840.

The previous prime is 161647699. The next prime is 161647771. The reversal of 161647717 is 717746161.

It is not a de Polignac number, because 161647717 - 2¹⁵ = 161614949 is a prime.

It is a super-2 number, since 2×161647717² = 52259968822624178, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161647717.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161647777) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 149413 + ... + 150490.

It is an arithmetic number, because the mean of its divisors is an integer number (17094528).

Almost surely, 2^161647717 is an apocalyptic number.

It is an amenable number.

161647717 is a deficient number, since it is larger than the sum of its proper divisors (43486619).

161647717 is a wasteful number, since it uses less digits than its factorization.

161647717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299928 (or 299921 counting only the distinct ones).

The product of its digits is 49392, while the sum is 40.

The square root of 161647717 is about 12714.0755464170. The cubic root of 161647717 is about 544.7407424984.

The spelling of 161647717 in words is "one hundred sixty-one million, six hundred forty-seven thousand, seven hundred seventeen".