161209815197184 has 600 divisors, whose sum is σ = 537837103311552. Its totient is φ = 48002857943040.

The previous prime is 161209815197177. The next prime is 161209815197201. The reversal of 161209815197184 is 481791518902161.

161209815197184 is a `hidden beast` number, since 1 + 6 + 1 + 20 + 9 + 81 + 519 + 7 + 18 + 4 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 216900822 + ... + 217642794.

Almost surely, 2^{161209815197184} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161209815197184, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (268918551655776).

161209815197184 is an abundant number, since it is smaller than the sum of its proper divisors (376627288114368).

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

161209815197184 is an equidigital number, since it uses as much as digits as its factorization.

161209815197184 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 742060 (or 742022 counting only the distinct ones).

The product of its (nonzero) digits is 8709120, while the sum is 63.

The spelling of 161209815197184 in words is "one hundred sixty-one trillion, two hundred nine billion, eight hundred fifteen million, one hundred ninety-seven thousand, one hundred eighty-four".