161139819204 has 672 divisors, whose sum is σ = 565973237760. Its totient is φ = 38925100800.

The previous prime is 161139819179. The next prime is 161139819289. The reversal of 161139819204 is 402918931161.

161139819204 is a `hidden beast` number, since 1 + 611 + 3 + 9 + 8 + 1 + 9 + 20 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 161139819204.

It is an unprimeable number.

It is a polite number, since it can be written in 223 ways as a sum of consecutive naturals, for example, 156294169 + ... + 156295199.

It is an arithmetic number, because the mean of its divisors is an integer number (842222080).

Almost surely, 2^161139819204 is an apocalyptic number.

161139819204 is a gapful number since it is divisible by the number (14) 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 161139819204, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (282986618880).

161139819204 is an abundant number, since it is smaller than the sum of its proper divisors (404833418556).

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

161139819204 is a wasteful number, since it uses less digits than its factorization.

161139819204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1123 (or 1106 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 45.

The spelling of 161139819204 in words is "one hundred sixty-one billion, one hundred thirty-nine million, eight hundred nineteen thousand, two hundred four".