161372560 has 40 divisors (see below), whose sum is σ = 376210296. Its totient is φ = 64373760.

The previous prime is 161372537. The next prime is 161372569. The reversal of 161372560 is 65273161.

It can be written as a sum of positive squares in 4 ways, for example, as 6718464 + 154654096 = 2592^2 + 12436^2 .

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

It is a super-2 number, since 2×161372560² = 52082206241907200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161372569) by changing a digit.

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, 29220 + ... + 34300.

Almost surely, 2^161372560 is an apocalyptic number.

161372560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161372560 is the 6352-nd decagonal number.

It is an amenable number.

161372560 is an abundant number, since it is smaller than the sum of its proper divisors (214837736).

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

161372560 is a wasteful number, since it uses less digits than its factorization.

161372560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5491 (or 5485 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 161372560 is about 12703.2499778600. The cubic root of 161372560 is about 544.4314807717.

The spelling of 161372560 in words is "one hundred sixty-one million, three hundred seventy-two thousand, five hundred sixty".