161813104580 has 12 divisors (see below), whose sum is σ = 339807519660. Its totient is φ = 64725241824.

The previous prime is 161813104571. The next prime is 161813104631. The reversal of 161813104580 is 85401318161.

It can be written as a sum of positive squares in 2 ways, for example, as 40837134724 + 120975969856 = 202082^2 + 347816^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4045327595 + ... + 4045327634.

It is an arithmetic number, because the mean of its divisors is an integer number (28317293305).

Almost surely, 2^161813104580 is an apocalyptic number.

161813104580 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161813104580 is an abundant number, since it is smaller than the sum of its proper divisors (177994415080).

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

161813104580 is a wasteful number, since it uses less digits than its factorization.

161813104580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8090655238 (or 8090655236 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 38.

The spelling of 161813104580 in words is "one hundred sixty-one billion, eight hundred thirteen million, one hundred four thousand, five hundred eighty".