161232798720 has 1056 divisors, whose sum is σ = 635107132800. Its totient is φ = 34758721536.

The previous prime is 161232798707. The next prime is 161232798833. The reversal of 161232798720 is 27897232161.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 161232798720.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1811604436 + ... + 1811604524.

Almost surely, 2^161232798720 is an apocalyptic number.

161232798720 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 161232798720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (317553566400).

161232798720 is an abundant number, since it is smaller than the sum of its proper divisors (473874334080).

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

161232798720 is a wasteful number, since it uses less digits than its factorization.

161232798720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243 (or 218 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 48.

The spelling of 161232798720 in words is "one hundred sixty-one billion, two hundred thirty-two million, seven hundred ninety-eight thousand, seven hundred twenty".