161959827043685 has 32 divisors (see below), whose sum is σ = 221716241584128. Its totient is φ = 112424362585920.

The previous prime is 161959827043673. The next prime is 161959827043741. The reversal of 161959827043685 is 586340728959161.

It is not a de Polignac number, because 161959827043685 - 2¹² = 161959827039589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 137677247 + ... + 138848636.

It is an arithmetic number, because the mean of its divisors is an integer number (6928632549504).

It is a 2-persistent number, because it is pandigital, and so is 2⋅161959827043685 = 323919654087370, but 3⋅161959827043685 = 485879481131055 is not.

Almost surely, 2^{161959827043685} is an apocalyptic number.

It is an amenable number.

161959827043685 is a deficient number, since it is larger than the sum of its proper divisors (59756414540443).

161959827043685 is a wasteful number, since it uses less digits than its factorization.

161959827043685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276526385.

The product of its (nonzero) digits is 783820800, while the sum is 74.

The spelling of 161959827043685 in words is "one hundred sixty-one trillion, nine hundred fifty-nine billion, eight hundred twenty-seven million, forty-three thousand, six hundred eighty-five".