161256043404 has 48 divisors (see below), whose sum is σ = 442663653600. Its totient is φ = 50590130688.

The previous prime is 161256043397. The next prime is 161256043441. The reversal of 161256043404 is 404340652161.

161256043404 is a `hidden beast` number, since 1 + 6 + 1 + 2 + 5 + 604 + 3 + 40 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43913209 + ... + 43916880.

It is an arithmetic number, because the mean of its divisors is an integer number (9222159450).

Almost surely, 2^161256043404 is an apocalyptic number.

It is an amenable number.

161256043404 is an abundant number, since it is smaller than the sum of its proper divisors (281407610196).

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

161256043404 is a wasteful number, since it uses less digits than its factorization.

161256043404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87830119 (or 87830111 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

Adding to 161256043404 its reverse (404340652161), we get a palindrome (565596695565).

The spelling of 161256043404 in words is "one hundred sixty-one billion, two hundred fifty-six million, forty-three thousand, four hundred four".