161678165 has 16 divisors (see below), whose sum is σ = 212155200. Its totient is φ = 117304320.

The previous prime is 161678141. The next prime is 161678189. The reversal of 161678165 is 561876161.

It is an interprime number because it is at equal distance from previous prime (161678141) and next prime (161678189).

It is not a de Polignac number, because 161678165 - 2⁸ = 161677909 is a prime.

It is a super-2 number, since 2×161678165² = 52279658075534450, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21422 + ... + 27968.

It is an arithmetic number, because the mean of its divisors is an integer number (13259700).

Almost surely, 2^161678165 is an apocalyptic number.

It is an amenable number.

161678165 is a deficient number, since it is larger than the sum of its proper divisors (50477035).

161678165 is a wasteful number, since it uses less digits than its factorization.

161678165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7012.

The product of its digits is 60480, while the sum is 41.

The square root of 161678165 is about 12715.2729030878. The cubic root of 161678165 is about 544.7749428471.

The spelling of 161678165 in words is "one hundred sixty-one million, six hundred seventy-eight thousand, one hundred sixty-five".