161890104044 has 24 divisors (see below), whose sum is σ = 285959546208. Its totient is φ = 80188102400.

The previous prime is 161890104007. The next prime is 161890104119. The reversal of 161890104044 is 440401098161.

It is a junction number, because it is equal to n+sod(n) for n = 161890103989 and 161890104007.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 812969 + ... + 992319.

It is an arithmetic number, because the mean of its divisors is an integer number (11914981092).

Almost surely, 2^161890104044 is an apocalyptic number.

It is an amenable number.

161890104044 is a deficient number, since it is larger than the sum of its proper divisors (124069442164).

161890104044 is a wasteful number, since it uses less digits than its factorization.

161890104044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181465 (or 181463 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 38.

The spelling of 161890104044 in words is "one hundred sixty-one billion, eight hundred ninety million, one hundred four thousand, forty-four".