161133561792 has 280 divisors, whose sum is σ = 563499284480. Its totient is φ = 44552747520.

The previous prime is 161133561769. The next prime is 161133561811. The reversal of 161133561792 is 297165331161.

161133561792 is a `hidden beast` number, since 1 + 6 + 1 + 13 + 3 + 561 + 79 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1053309 + ... + 1196547.

Almost surely, 2^161133561792 is an apocalyptic number.

161133561792 is a gapful number since it is divisible by the number (12) 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 161133561792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (281749642240).

161133561792 is an abundant number, since it is smaller than the sum of its proper divisors (402365722688).

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

161133561792 is a wasteful number, since it uses less digits than its factorization.

161133561792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143301 (or 143282 counting only the distinct ones).

The product of its digits is 204120, while the sum is 45.

The spelling of 161133561792 in words is "one hundred sixty-one billion, one hundred thirty-three million, five hundred sixty-one thousand, seven hundred ninety-two".