161061655218 has 32 divisors (see below), whose sum is σ = 339654954240. Its totient is φ = 50774907600.

The previous prime is 161061655163. The next prime is 161061655241. The reversal of 161061655218 is 812556160161.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 161061655218.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1136508 + ... + 1270343.

It is an arithmetic number, because the mean of its divisors is an integer number (10614217320).

Almost surely, 2^161061655218 is an apocalyptic number.

161061655218 is an abundant number, since it is smaller than the sum of its proper divisors (178593299022).

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

161061655218 is a wasteful number, since it uses less digits than its factorization.

161061655218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2407462.

The product of its (nonzero) digits is 86400, while the sum is 42.

The spelling of 161061655218 in words is "one hundred sixty-one billion, sixty-one million, six hundred fifty-five thousand, two hundred eighteen".