161256317044 has 24 divisors (see below), whose sum is σ = 293655589920. Its totient is φ = 77418282144.

The previous prime is 161256317021. The next prime is 161256317069. The reversal of 161256317044 is 440713652161.

It is a junction number, because it is equal to n+sod(n) for n = 161256316988 and 161256317006.

It is a congruent number.

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, 7935079 + ... + 7955374.

It is an arithmetic number, because the mean of its divisors is an integer number (12235649580).

Almost surely, 2^161256317044 is an apocalyptic number.

It is an amenable number.

161256317044 is a deficient number, since it is larger than the sum of its proper divisors (132399272876).

161256317044 is a wasteful number, since it uses less digits than its factorization.

161256317044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15890559 (or 15890557 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 40.

The spelling of 161256317044 in words is "one hundred sixty-one billion, two hundred fifty-six million, three hundred seventeen thousand, forty-four".