161605560011560 has 128 divisors (see below), whose sum is σ = 429893273548800. Its totient is φ = 53496196346880.

The previous prime is 161605560011557. The next prime is 161605560011561. The reversal of 161605560011560 is 65110065506161.

It is a super-2 number, since 2×161605560011560² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161605560011561) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 776013609 + ... + 776221831.

It is an arithmetic number, because the mean of its divisors is an integer number (3358541199600).

Almost surely, 2^{161605560011560} is an apocalyptic number.

161605560011560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161605560011560 is an abundant number, since it is smaller than the sum of its proper divisors (268287713537240).

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

161605560011560 is a wasteful number, since it uses less digits than its factorization.

161605560011560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303851 (or 303847 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 43.

The spelling of 161605560011560 in words is "one hundred sixty-one trillion, six hundred five billion, five hundred sixty million, eleven thousand, five hundred sixty".