161560243680 has 384 divisors, whose sum is σ = 591471175680. Its totient is φ = 36655810560.

The previous prime is 161560243643. The next prime is 161560243717. The reversal of 161560243680 is 86342065161.

It is an interprime number because it is at equal distance from previous prime (161560243643) and next prime (161560243717).

It is a super-2 number, since 2×161560243680² (a number of 23 digits) contains 22 as substring.

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, 8316859 + ... + 8336261.

It is an arithmetic number, because the mean of its divisors is an integer number (1540289520).

Almost surely, 2^161560243680 is an apocalyptic number.

161560243680 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 161560243680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (295735587840).

161560243680 is an abundant number, since it is smaller than the sum of its proper divisors (429910932000).

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

161560243680 is a wasteful number, since it uses less digits than its factorization.

161560243680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19534 (or 19526 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 42.

The spelling of 161560243680 in words is "one hundred sixty-one billion, five hundred sixty million, two hundred forty-three thousand, six hundred eighty".