161686592 has 28 divisors (see below), whose sum is σ = 339722460. Its totient is φ = 76087296.

The previous prime is 161686543. The next prime is 161686601. The reversal of 161686592 is 295686161.

It can be written as a sum of positive squares in 2 ways, for example, as 93392896 + 68293696 = 9664^2 + 8264^2 .

It is a super-2 number, since 2×161686592² = 52285108065148928, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73217 + ... + 75392.

It is an arithmetic number, because the mean of its divisors is an integer number (12132945).

Almost surely, 2^161686592 is an apocalyptic number.

It is an amenable number.

161686592 is an abundant number, since it is smaller than the sum of its proper divisors (178035868).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161686592 is a wasteful number, since it uses less digits than its factorization.

161686592 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148638 (or 148628 counting only the distinct ones).

The product of its digits is 155520, while the sum is 44.

The square root of 161686592 is about 12715.6042719172. The cubic root of 161686592 is about 544.7844076145.

The spelling of 161686592 in words is "one hundred sixty-one million, six hundred eighty-six thousand, five hundred ninety-two".