161601860 has 24 divisors (see below), whose sum is σ = 387844800. Its totient is φ = 55406304.

The previous prime is 161601809. The next prime is 161601883. The reversal of 161601860 is 68106161.

It is a super-2 number, since 2×161601860² = 52230322310919200, 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, 577010 + ... + 577289.

It is an arithmetic number, because the mean of its divisors is an integer number (16160200).

Almost surely, 2^161601860 is an apocalyptic number.

161601860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161601860 is an abundant number, since it is smaller than the sum of its proper divisors (226242940).

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

161601860 is a wasteful number, since it uses less digits than its factorization.

161601860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1154315 (or 1154313 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 161601860 is about 12712.2720235212. The cubic root of 161601860 is about 544.6892260708.

The spelling of 161601860 in words is "one hundred sixty-one million, six hundred one thousand, eight hundred sixty".