161156660 has 48 divisors (see below), whose sum is σ = 387555840. Its totient is φ = 55142400.

The previous prime is 161156657. The next prime is 161156717. The reversal of 161156660 is 66651161.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 99860 + ... + 101460.

It is an arithmetic number, because the mean of its divisors is an integer number (8074080).

Almost surely, 2^161156660 is an apocalyptic number.

161156660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161156660 is an abundant number, since it is smaller than the sum of its proper divisors (226399180).

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

161156660 is a wasteful number, since it uses less digits than its factorization.

161156660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2336 (or 2334 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 161156660 is about 12694.7493082770. The cubic root of 161156660 is about 544.1885745103.

The spelling of 161156660 in words is "one hundred sixty-one million, one hundred fifty-six thousand, six hundred sixty".