161912464 has 80 divisors (see below), whose sum is σ = 370115200. Its totient is φ = 68584320.

The previous prime is 161912441. The next prime is 161912503. The reversal of 161912464 is 464219161.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 894454 + ... + 894634.

It is an arithmetic number, because the mean of its divisors is an integer number (4626440).

Almost surely, 2^161912464 is an apocalyptic number.

161912464 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 161912464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (185057600).

161912464 is an abundant number, since it is smaller than the sum of its proper divisors (208202736).

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

161912464 is a wasteful number, since it uses less digits than its factorization.

161912464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373 (or 353 counting only the distinct ones).

The product of its digits is 10368, while the sum is 34.

The square root of 161912464 is about 12724.4828578611. The cubic root of 161912464 is about 545.0379728332.

The spelling of 161912464 in words is "one hundred sixty-one million, nine hundred twelve thousand, four hundred sixty-four".