161606109999960 has 256 divisors, whose sum is σ = 567546707520000. Its totient is φ = 40790250542592.

The previous prime is 161606109999931. The next prime is 161606109999973. The reversal of 161606109999960 is 69999901606161.

161606109999960 is a `hidden beast` number, since 1 + 6 + 1 + 606 + 1 + 0 + 9 + 9 + 9 + 9 + 9 + 6 + 0 = 666.

It is a super-2 number, since 2×161606109999960² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 19395531 + ... + 26446149.

It is an arithmetic number, because the mean of its divisors is an integer number (2216979326250).

Almost surely, 2^{161606109999960} is an apocalyptic number.

161606109999960 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161606109999960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (283773353760000).

161606109999960 is an abundant number, since it is smaller than the sum of its proper divisors (405940597520040).

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

161606109999960 is a wasteful number, since it uses less digits than its factorization.

161606109999960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7051775 (or 7051765 counting only the distinct ones).

The product of its (nonzero) digits is 76527504, while the sum is 72.

The spelling of 161606109999960 in words is "one hundred sixty-one trillion, six hundred six billion, one hundred nine million, nine hundred ninety-nine thousand, nine hundred sixty".