161603660 has 24 divisors (see below), whose sum is σ = 351071280. Its totient is φ = 62412224.

The previous prime is 161603653. The next prime is 161603707. The reversal of 161603660 is 66306161.

It is a super-2 number, since 2×161603660² = 52231485850791200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138734 + ... + 139893.

It is an arithmetic number, because the mean of its divisors is an integer number (14627970).

Almost surely, 2^161603660 is an apocalyptic number.

161603660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161603660 is an abundant number, since it is smaller than the sum of its proper divisors (189467620).

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

161603660 is a wasteful number, since it uses less digits than its factorization.

161603660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278665 (or 278663 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 161603660 is about 12712.3428210539. The cubic root of 161603660 is about 544.6912484010.

The spelling of 161603660 in words is "one hundred sixty-one million, six hundred three thousand, six hundred sixty".