161561056011560 has 64 divisors (see below), whose sum is σ = 363847689400320. Its totient is φ = 64564817190400.

The previous prime is 161561056011557. The next prime is 161561056011577. The reversal of 161561056011560 is 65110650165161.

It is a super-2 number, since 2×161561056011560² (a number of 29 digits) contains 22 as substring.

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, 967539197 + ... + 967706163.

It is an arithmetic number, because the mean of its divisors is an integer number (5685120146880).

Almost surely, 2^{161561056011560} is an apocalyptic number.

161561056011560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161561056011560 is an abundant number, since it is smaller than the sum of its proper divisors (202286633388760).

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

161561056011560 is a wasteful number, since it uses less digits than its factorization.

161561056011560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189146 (or 189142 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 44.

The spelling of 161561056011560 in words is "one hundred sixty-one trillion, five hundred sixty-one billion, fifty-six million, eleven thousand, five hundred sixty".