161995295574 has 128 divisors (see below), whose sum is σ = 417512309760. Its totient is φ = 45600019200.

The previous prime is 161995295557. The next prime is 161995295593. The reversal of 161995295574 is 475592599161.

161995295574 is a `hidden beast` number, since 1 + 6 + 1 + 9 + 9 + 52 + 9 + 5 + 574 = 666.

161995295574 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (63).

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, 30102364 + ... + 30107744.

It is an arithmetic number, because the mean of its divisors is an integer number (3261814920).

Almost surely, 2^161995295574 is an apocalyptic number.

161995295574 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 161995295574, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (208756154880).

161995295574 is an abundant number, since it is smaller than the sum of its proper divisors (255517014186).

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

161995295574 is a wasteful number, since it uses less digits than its factorization.

161995295574 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6563 (or 6557 counting only the distinct ones).

The product of its digits is 30618000, while the sum is 63.

The spelling of 161995295574 in words is "one hundred sixty-one billion, nine hundred ninety-five million, two hundred ninety-five thousand, five hundred seventy-four".