161605512 has 48 divisors (see below), whose sum is σ = 439920000. Its totient is φ = 53593056.

The previous prime is 161605501. The next prime is 161605513. The reversal of 161605512 is 215506161.

It is a happy number.

161605512 is a `hidden beast` number, since 1 + 6 + 1 + 605 + 51 + 2 = 666.

It is a super-2 number, since 2×161605512² = 52232683017564288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161605513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8689 + ... + 19967.

It is an arithmetic number, because the mean of its divisors is an integer number (9165000).

Almost surely, 2^161605512 is an apocalyptic number.

161605512 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161605512 is an abundant number, since it is smaller than the sum of its proper divisors (278314488).

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

161605512 is a wasteful number, since it uses less digits than its factorization.

161605512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11490 (or 11483 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 161605512 is about 12712.4156634371. The cubic root of 161605512 is about 544.6933291384.

The spelling of 161605512 in words is "one hundred sixty-one million, six hundred five thousand, five hundred twelve".