172841561256 has 256 divisors, whose sum is σ = 551100211200. Its totient is φ = 43958992896.

The previous prime is 172841561159. The next prime is 172841561327. The reversal of 172841561256 is 652165148271.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7407400 + ... + 7430696.

It is an arithmetic number, because the mean of its divisors is an integer number (2152735200).

Almost surely, 2^172841561256 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 172841561256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (275550105600).

172841561256 is an abundant number, since it is smaller than the sum of its proper divisors (378258649944).

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

172841561256 is a wasteful number, since it uses less digits than its factorization.

172841561256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23448 (or 23444 counting only the distinct ones).

The product of its digits is 806400, while the sum is 48.

The spelling of 172841561256 in words is "one hundred seventy-two billion, eight hundred forty-one million, five hundred sixty-one thousand, two hundred fifty-six".