161363681280 has 448 divisors, whose sum is σ = 584739414720. Its totient is φ = 42203086848.

The previous prime is 161363681243. The next prime is 161363681287. The reversal of 161363681280 is 82186363161.

161363681280 is a `hidden beast` number, since 1 + 6 + 1 + 3 + 6 + 368 + 1 + 280 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161363681287) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 58612384 + ... + 58615136.

Almost surely, 2^161363681280 is an apocalyptic number.

161363681280 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 161363681280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (292369707360).

161363681280 is an abundant number, since it is smaller than the sum of its proper divisors (423375733440).

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

161363681280 is an equidigital number, since it uses as much as digits as its factorization.

161363681280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2846 (or 2816 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The spelling of 161363681280 in words is "one hundred sixty-one billion, three hundred sixty-three million, six hundred eighty-one thousand, two hundred eighty".