161661185 has 16 divisors (see below), whose sum is σ = 221951232. Its totient is φ = 110731200.

The previous prime is 161661161. The next prime is 161661191. The reversal of 161661185 is 581166161.

It is not a de Polignac number, because 161661185 - 2⁸ = 161660929 is a prime.

It is a super-2 number, since 2×161661185² = 52268677471208450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Duffinian 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, 39380 + ... + 43290.

It is an arithmetic number, because the mean of its divisors is an integer number (13871952).

Almost surely, 2^161661185 is an apocalyptic number.

It is an amenable number.

161661185 is a deficient number, since it is larger than the sum of its proper divisors (60290047).

161661185 is a wasteful number, since it uses less digits than its factorization.

161661185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5104.

The product of its digits is 8640, while the sum is 35.

The square root of 161661185 is about 12714.6051845899. The cubic root of 161661185 is about 544.7558707966.

The spelling of 161661185 in words is "one hundred sixty-one million, six hundred sixty-one thousand, one hundred eighty-five".