161509887216 has 30 divisors (see below), whose sum is σ = 452003365320. Its totient is φ = 53836629024.

The previous prime is 161509887197. The next prime is 161509887223. The reversal of 161509887216 is 612788905161.

It is a happy number.

161509887216 is a `hidden beast` number, since 1 + 61 + 509 + 8 + 8 + 72 + 1 + 6 = 666.

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, 560798076 + ... + 560798363.

It is an arithmetic number, because the mean of its divisors is an integer number (15066778844).

Almost surely, 2^161509887216 is an apocalyptic number.

161509887216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

161509887216 is an abundant number, since it is smaller than the sum of its proper divisors (290493478104).

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

161509887216 is a wasteful number, since it uses less digits than its factorization.

161509887216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1121596453 (or 1121596444 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 54.

The spelling of 161509887216 in words is "one hundred sixty-one billion, five hundred nine million, eight hundred eighty-seven thousand, two hundred sixteen".