161319443712 has 144 divisors (see below), whose sum is σ = 491560742400. Its totient is φ = 46008539136.

The previous prime is 161319443653. The next prime is 161319443743. The reversal of 161319443712 is 217344913161.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3000039 + ... + 3053337.

Almost surely, 2^161319443712 is an apocalyptic number.

161319443712 is a gapful number since it is divisible by the number (12) 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 161319443712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (245780371200).

161319443712 is an abundant number, since it is smaller than the sum of its proper divisors (330241298688).

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

161319443712 is an equidigital number, since it uses as much as digits as its factorization.

161319443712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53888 (or 53874 counting only the distinct ones).

The product of its digits is 108864, while the sum is 42.

The spelling of 161319443712 in words is "one hundred sixty-one billion, three hundred nineteen million, four hundred forty-three thousand, seven hundred twelve".