161491792504320 has 960 divisors, whose sum is σ = 583556055825600. Its totient is φ = 42331237908480.

The previous prime is 161491792504319. The next prime is 161491792504349. The reversal of 161491792504320 is 23405297194161.

161491792504320 is a `hidden beast` number, since 1 + 6 + 1 + 4 + 9 + 17 + 92 + 504 + 32 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (960).

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

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 95 ways as a sum of consecutive naturals, for example, 109042397980 + ... + 109042399460.

It is an arithmetic number, because the mean of its divisors is an integer number (607870891485).

Almost surely, 2^{161491792504320} is an apocalyptic number.

161491792504320 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 161491792504320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (291778027912800).

161491792504320 is an abundant number, since it is smaller than the sum of its proper divisors (422064263321280).

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

161491792504320 is an equidigital number, since it uses as much as digits as its factorization.

161491792504320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1908 (or 1803 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 54.

The spelling of 161491792504320 in words is "one hundred sixty-one trillion, four hundred ninety-one billion, seven hundred ninety-two million, five hundred four thousand, three hundred twenty".