161133756 has 72 divisors (see below), whose sum is σ = 460414080. Its totient is φ = 43612128.

The previous prime is 161133751. The next prime is 161133787. The reversal of 161133756 is 657331161.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161133751) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3961 + ... + 18383.

It is an arithmetic number, because the mean of its divisors is an integer number (6394640).

Almost surely, 2^161133756 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161133756, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (230207040).

161133756 is an abundant number, since it is smaller than the sum of its proper divisors (299280324).

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

161133756 is a wasteful number, since it uses less digits than its factorization.

161133756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14463 (or 14454 counting only the distinct ones).

The product of its digits is 11340, while the sum is 33.

The square root of 161133756 is about 12693.8471709722. The cubic root of 161133756 is about 544.1627927944.

The spelling of 161133756 in words is "one hundred sixty-one million, one hundred thirty-three thousand, seven hundred fifty-six".