161052572180 has 24 divisors (see below), whose sum is σ = 338220640968. Its totient is φ = 64419078528.

The previous prime is 161052572171. The next prime is 161052572203. The reversal of 161052572180 is 81275250161.

It can be written as a sum of positive squares in 4 ways, for example, as 2804549764 + 158248022416 = 52958^2 + 397804^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 685742 + ... + 890138.

It is an arithmetic number, because the mean of its divisors is an integer number (14092526707).

Almost surely, 2^161052572180 is an apocalyptic number.

161052572180 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161052572180 is an abundant number, since it is smaller than the sum of its proper divisors (177168068788).

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

161052572180 is a wasteful number, since it uses less digits than its factorization.

161052572180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243803 (or 243801 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 38.

The spelling of 161052572180 in words is "one hundred sixty-one billion, fifty-two million, five hundred seventy-two thousand, one hundred eighty".