161606055565560 has 128 divisors (see below), whose sum is σ = 515231116185600. Its totient is φ = 40410283345920.

The previous prime is 161606055565481. The next prime is 161606055565589. The reversal of 161606055565560 is 65565550606161.

It is a super-2 number, since 2×161606055565560² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161606055565560.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 145607040 + ... + 146712719.

It is an arithmetic number, because the mean of its divisors is an integer number (4025243095200).

Almost surely, 2^{161606055565560} is an apocalyptic number.

161606055565560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161606055565560 is an abundant number, since it is smaller than the sum of its proper divisors (353625060620040).

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

161606055565560 is a wasteful number, since it uses less digits than its factorization.

161606055565560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292320061 (or 292320057 counting only the distinct ones).

The product of its (nonzero) digits is 24300000, while the sum is 57.

The spelling of 161606055565560 in words is "one hundred sixty-one trillion, six hundred six billion, fifty-five million, five hundred sixty-five thousand, five hundred sixty".