161001660 has 24 divisors (see below), whose sum is σ = 450804816. Its totient is φ = 42933760.

The previous prime is 161001613. The next prime is 161001671. The reversal of 161001660 is 66100161.

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 7 ways as a sum of consecutive naturals, for example, 1341621 + ... + 1341740.

It is an arithmetic number, because the mean of its divisors is an integer number (18783534).

Almost surely, 2^161001660 is an apocalyptic number.

161001660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161001660 is an abundant number, since it is smaller than the sum of its proper divisors (289803156).

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

161001660 is a wasteful number, since it uses less digits than its factorization.

161001660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2683373 (or 2683371 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 161001660 is about 12688.6429534446. The cubic root of 161001660 is about 544.0140522250.

The spelling of 161001660 in words is "one hundred sixty-one million, one thousand, six hundred sixty".