161794721249280 has 864 divisors, whose sum is σ = 652523146395120. Its totient is φ = 36969153822720.

The previous prime is 161794721249263. The next prime is 161794721249311. The reversal of 161794721249280 is 82942127497161.

161794721249280 is a `hidden beast` number, since 1 + 6 + 1 + 7 + 9 + 47 + 21 + 2 + 492 + 80 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 23243025000 + ... + 23243031960.

Almost surely, 2^{161794721249280} is an apocalyptic number.

161794721249280 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 161794721249280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (326261573197560).

161794721249280 is an abundant number, since it is smaller than the sum of its proper divisors (490728425145840).

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

161794721249280 is a wasteful number, since it uses less digits than its factorization.

161794721249280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12155 (or 12125 counting only the distinct ones).

The product of its (nonzero) digits is 24385536, while the sum is 63.

The spelling of 161794721249280 in words is "one hundred sixty-one trillion, seven hundred ninety-four billion, seven hundred twenty-one million, two hundred forty-nine thousand, two hundred eighty".