161291952100 has 36 divisors (see below), whose sum is σ = 355935812400. Its totient is φ = 63423273760.

The previous prime is 161291952089. The next prime is 161291952233. The reversal of 161291952100 is 1259192161.

It is a self number, because there is not a number n which added to its sum of digits gives 161291952100.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13662910 + ... + 13674709.

It is an arithmetic number, because the mean of its divisors is an integer number (9887105900).

Almost surely, 2^161291952100 is an apocalyptic number.

161291952100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161291952100 is an abundant number, since it is smaller than the sum of its proper divisors (194643860300).

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

161291952100 is a wasteful number, since it uses less digits than its factorization.

161291952100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27337692 (or 27337685 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 37.

The spelling of 161291952100 in words is "one hundred sixty-one billion, two hundred ninety-one million, nine hundred fifty-two thousand, one hundred".