161155660 has 24 divisors (see below), whose sum is σ = 338826096. Its totient is φ = 64386240.

The previous prime is 161155613. The next prime is 161155679. The reversal of 161155660 is 66551161.

It is a super-2 number, since 2×161155660² = 51942293500071200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14539 + ... + 23101.

It is an arithmetic number, because the mean of its divisors is an integer number (14117754).

Almost surely, 2^161155660 is an apocalyptic number.

161155660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161155660 is an abundant number, since it is smaller than the sum of its proper divisors (177670436).

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

161155660 is a wasteful number, since it uses less digits than its factorization.

161155660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9513 (or 9511 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 161155660 is about 12694.7099218533. The cubic root of 161155660 is about 544.1874489188.

The spelling of 161155660 in words is "one hundred sixty-one million, one hundred fifty-five thousand, six hundred sixty".