161519031968 has 96 divisors (see below), whose sum is σ = 377900328960. Its totient is φ = 66488647680.

The previous prime is 161519031937. The next prime is 161519032021. The reversal of 161519031968 is 869130915161.

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, 1189313 + ... + 1318143.

It is an arithmetic number, because the mean of its divisors is an integer number (3936461760).

Almost surely, 2^161519031968 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 161519031968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (188950164480).

161519031968 is an abundant number, since it is smaller than the sum of its proper divisors (216381296992).

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

161519031968 is a wasteful number, since it uses less digits than its factorization.

161519031968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129070 (or 129062 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 50.

The spelling of 161519031968 in words is "one hundred sixty-one billion, five hundred nineteen million, thirty-one thousand, nine hundred sixty-eight".