161151616 has 128 divisors (see below), whose sum is σ = 366220800. Its totient is φ = 70253568.

The previous prime is 161151589. The next prime is 161151631. The reversal of 161151616 is 616151161.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×161151616² = 51939686678822912, which contains 22 as substring.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 2405215 + ... + 2405281.

It is an arithmetic number, because the mean of its divisors is an integer number (2861100).

Almost surely, 2^161151616 is an apocalyptic number.

161151616 is a gapful number since it is divisible by the number (16) 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 161151616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (183110400).

161151616 is an abundant number, since it is smaller than the sum of its proper divisors (205069184).

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

161151616 is a wasteful number, since it uses less digits than its factorization.

161151616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166 (or 154 counting only the distinct ones).

The product of its digits is 1080, while the sum is 28.

The square root of 161151616 is about 12694.5506419093. The cubic root of 161151616 is about 544.1828969792.

The spelling of 161151616 in words is "one hundred sixty-one million, one hundred fifty-one thousand, six hundred sixteen".