161568090 has 24 divisors (see below), whose sum is σ = 420077268. Its totient is φ = 43084800.

The previous prime is 161568089. The next prime is 161568101. The reversal of 161568090 is 90865161.

161568090 is a `hidden beast` number, since 1 + 6 + 1 + 568 + 0 + 90 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 160047801 + 1520289 = 12651^2 + 1233^2 .

It is a super-2 number, since 2×161568090² = 52208495412496200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 897511 + ... + 897690.

Almost surely, 2^161568090 is an apocalyptic number.

161568090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161568090 is an abundant number, since it is smaller than the sum of its proper divisors (258509178).

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

161568090 is a wasteful number, since it uses less digits than its factorization.

161568090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1795214 (or 1795211 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 161568090 is about 12710.9437100477. The cubic root of 161568090 is about 544.6512821251.

The spelling of 161568090 in words is "one hundred sixty-one million, five hundred sixty-eight thousand, ninety".