161840560 has 40 divisors (see below), whose sum is σ = 430034976. Its totient is φ = 55488000.

The previous prime is 161840557. The next prime is 161840563. The reversal of 161840560 is 65048161.

It is an interprime number because it is at equal distance from previous prime (161840557) and next prime (161840563).

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×161840560² = 52384733722227200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161840563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143941 + ... + 145060.

Almost surely, 2^161840560 is an apocalyptic number.

161840560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161840560 is an abundant number, since it is smaller than the sum of its proper divisors (268194416).

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

161840560 is a wasteful number, since it uses less digits than its factorization.

161840560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289021 (or 289015 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 161840560 is about 12721.6571247617. The cubic root of 161840560 is about 544.9572785860.

It can be divided in two parts, 161840 and 560, that multiplied together give a square (90630400 = 9520²).

The spelling of 161840560 in words is "one hundred sixty-one million, eight hundred forty thousand, five hundred sixty".