161061655216 has 160 divisors (see below), whose sum is σ = 400214384640. Its totient is φ = 60971270400.

The previous prime is 161061655163. The next prime is 161061655241. The reversal of 161061655216 is 612556160161.

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 31 ways as a sum of consecutive naturals, for example, 8038651 + ... + 8058661.

It is an arithmetic number, because the mean of its divisors is an integer number (2501339904).

Almost surely, 2^161061655216 is an apocalyptic number.

161061655216 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 161061655216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (200107192320).

161061655216 is an abundant number, since it is smaller than the sum of its proper divisors (239152729424).

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

161061655216 is a wasteful number, since it uses less digits than its factorization.

161061655216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20223 (or 20217 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 40.

The spelling of 161061655216 in words is "one hundred sixty-one billion, sixty-one million, six hundred fifty-five thousand, two hundred sixteen".