161815682139744 has 96 divisors (see below), whose sum is σ = 450958182887520. Its totient is φ = 50629602926592.

The previous prime is 161815682139697. The next prime is 161815682139767. The reversal of 161815682139744 is 447931286518161.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a hoax number, since the sum of its digits (66) coincides with the sum of the digits of its distinct prime factors.

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 15 ways as a sum of consecutive naturals, for example, 132302479 + ... + 133519950.

It is an arithmetic number, because the mean of its divisors is an integer number (4697481071745).

Almost surely, 2^{161815682139744} is an apocalyptic number.

It is an amenable number.

161815682139744 is an abundant number, since it is smaller than the sum of its proper divisors (289142500747776).

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

161815682139744 is a wasteful number, since it uses less digits than its factorization.

161815682139744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265822832 (or 265822824 counting only the distinct ones).

The product of its digits is 69672960, while the sum is 66.

The spelling of 161815682139744 in words is "one hundred sixty-one trillion, eight hundred fifteen billion, six hundred eighty-two million, one hundred thirty-nine thousand, seven hundred forty-four".