161783133844 has 48 divisors (see below), whose sum is σ = 301124621952. Its totient is φ = 75791020032.

The previous prime is 161783133829. The next prime is 161783133851. The reversal of 161783133844 is 448331387161.

It is a congruent number.

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, 18512644 + ... + 18521380.

It is an arithmetic number, because the mean of its divisors is an integer number (6273429624).

Almost surely, 2^161783133844 is an apocalyptic number.

It is an amenable number.

161783133844 is a deficient number, since it is larger than the sum of its proper divisors (139341488108).

161783133844 is a wasteful number, since it uses less digits than its factorization.

161783133844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9952 (or 9950 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 49.

The spelling of 161783133844 in words is "one hundred sixty-one billion, seven hundred eighty-three million, one hundred thirty-three thousand, eight hundred forty-four".