161595540 has 192 divisors, whose sum is σ = 551577600. Its totient is φ = 39094272.

The previous prime is 161595517. The next prime is 161595571. The reversal of 161595540 is 45595161.

161595540 is a `hidden beast` number, since 1 + 61 + 59 + 5 + 540 = 666.

It is a super-2 number, since 2×161595540² = 52226237095783200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 161595495 and 161595504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 265917 + ... + 266523.

It is an arithmetic number, because the mean of its divisors is an integer number (2872800).

Almost surely, 2^161595540 is an apocalyptic number.

161595540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161595540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (275788800).

161595540 is an abundant number, since it is smaller than the sum of its proper divisors (389982060).

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

161595540 is a wasteful number, since it uses less digits than its factorization.

161595540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 671 (or 663 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The square root of 161595540 is about 12712.0234423950. The cubic root of 161595540 is about 544.6821253258.

The spelling of 161595540 in words is "one hundred sixty-one million, five hundred ninety-five thousand, five hundred forty".