161765312 has 42 divisors (see below), whose sum is σ = 328882248. Its totient is φ = 78943872.

The previous prime is 161765293. The next prime is 161765333. The reversal of 161765312 is 213567161.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 117653 + ... + 119019.

Almost surely, 2^161765312 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 161765312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (164441124).

161765312 is an abundant number, since it is smaller than the sum of its proper divisors (167116936).

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

161765312 is an equidigital number, since it uses as much as digits as its factorization.

161765312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1465 (or 1412 counting only the distinct ones).

The product of its digits is 7560, while the sum is 32.

The square root of 161765312 is about 12718.6993045673. The cubic root of 161765312 is about 544.8728059372.

The spelling of 161765312 in words is "one hundred sixty-one million, seven hundred sixty-five thousand, three hundred twelve".