161195580 has 216 divisors, whose sum is σ = 605902752. Its totient is φ = 33965568.

The previous prime is 161195561. The next prime is 161195591. The reversal of 161195580 is 85591161.

161195580 is a `hidden beast` number, since 1 + 61 + 19 + 5 + 580 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 212562 + ... + 213318.

Almost surely, 2^161195580 is an apocalyptic number.

161195580 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 161195580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (302951376).

161195580 is an abundant number, since it is smaller than the sum of its proper divisors (444707172).

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

161195580 is a wasteful number, since it uses less digits than its factorization.

161195580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 805 (or 787 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 36.

The square root of 161195580 is about 12696.2821329711. The cubic root of 161195580 is about 544.2323789147.

The spelling of 161195580 in words is "one hundred sixty-one million, one hundred ninety-five thousand, five hundred eighty".