161610540 has 96 divisors (see below), whose sum is σ = 556953600. Its totient is φ = 34096896.

The previous prime is 161610511. The next prime is 161610557. The reversal of 161610540 is 45016161.

It is a super-2 number, since 2×161610540² = 52235933278183200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161610540.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9340 + ... + 20259.

It is an arithmetic number, because the mean of its divisors is an integer number (5801600).

Almost surely, 2^161610540 is an apocalyptic number.

161610540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161610540 is an abundant number, since it is smaller than the sum of its proper divisors (395343060).

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

161610540 is a wasteful number, since it uses less digits than its factorization.

161610540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29631 (or 29629 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 161610540 is about 12712.6134213229. The cubic root of 161610540 is about 544.6989780580.

The spelling of 161610540 in words is "one hundred sixty-one million, six hundred ten thousand, five hundred forty".