161797409280 has 1200 divisors, whose sum is σ = 663259021920. Its totient is φ = 37730893824.

The previous prime is 161797409233. The next prime is 161797409317. The reversal of 161797409280 is 82904797161.

161797409280 is a `hidden beast` number, since 161 + 79 + 7 + 409 + 2 + 8 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 8515653111 + ... + 8515653129.

Almost surely, 2^161797409280 is an apocalyptic number.

161797409280 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 161797409280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (331629510960).

161797409280 is an abundant number, since it is smaller than the sum of its proper divisors (501461612640).

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

161797409280 is an frugal number, since it uses more digits than its factorization.

161797409280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95 (or 42 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 54.

The spelling of 161797409280 in words is "one hundred sixty-one billion, seven hundred ninety-seven million, four hundred nine thousand, two hundred eighty".