161515216 has 20 divisors (see below), whose sum is σ = 315863712. Its totient is φ = 80002016.

The previous prime is 161515183. The next prime is 161515217. The reversal of 161515216 is 612515161.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161515217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45460 + ... + 48883.

Almost surely, 2^161515216 is an apocalyptic number.

161515216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

161515216 is a deficient number, since it is larger than the sum of its proper divisors (154348496).

161515216 is a wasteful number, since it uses less digits than its factorization.

161515216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94458 (or 94452 counting only the distinct ones).

The product of its digits is 1800, while the sum is 28.

The square root of 161515216 is about 12708.8636785513. The cubic root of 161515216 is about 544.5918623187.

The spelling of 161515216 in words is "one hundred sixty-one million, five hundred fifteen thousand, two hundred sixteen".