161018215680 has 576 divisors, whose sum is σ = 601189521408. Its totient is φ = 35968942080.

The previous prime is 161018215669. The next prime is 161018215693. The reversal of 161018215680 is 86512810161.

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, 464029267 + ... + 464029613.

It is an arithmetic number, because the mean of its divisors is an integer number (1043731808).

Almost surely, 2^161018215680 is an apocalyptic number.

161018215680 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 161018215680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (300594760704).

161018215680 is an abundant number, since it is smaller than the sum of its proper divisors (440171305728).

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

161018215680 is a wasteful number, since it uses less digits than its factorization.

161018215680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 722 (or 708 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 39.

The spelling of 161018215680 in words is "one hundred sixty-one billion, eighteen million, two hundred fifteen thousand, six hundred eighty".