161606111556560 has 80 divisors (see below), whose sum is σ = 410619915518400. Its totient is φ = 58661478712320.

The previous prime is 161606111556511. The next prime is 161606111556587. The reversal of 161606111556560 is 65655111606161.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×161606111556560² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161606111556499 and 161606111556508.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 162598085 + ... + 163588964.

It is an arithmetic number, because the mean of its divisors is an integer number (5132748943980).

Almost surely, 2^{161606111556560} is an apocalyptic number.

161606111556560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161606111556560 is an abundant number, since it is smaller than the sum of its proper divisors (249013803961840).

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

161606111556560 is a wasteful number, since it uses less digits than its factorization.

161606111556560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326187636 (or 326187630 counting only the distinct ones).

The product of its (nonzero) digits is 972000, while the sum is 50.

The spelling of 161606111556560 in words is "one hundred sixty-one trillion, six hundred six billion, one hundred eleven million, five hundred fifty-six thousand, five hundred sixty".