255643494544 has 45 divisors (see below), whose sum is σ = 507849361849. Its totient is φ = 124663694720.

The previous prime is 255643494539. The next prime is 255643494551. The reversal of 255643494544 is 445494346552.

The square root of 255643494544 is 505612.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 12318336144 + 243325158400 = 110988^2 + 493280^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 82918827 + ... + 82921909.

Almost surely, 2^255643494544 is an apocalyptic number.

255643494544 is the 505612-nd square number.

It is an amenable number.

255643494544 is a deficient number, since it is larger than the sum of its proper divisors (252205867305).

255643494544 is an frugal number, since it uses more digits than its factorization.

255643494544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6256 (or 3126 counting only the distinct ones).

The product of its digits is 41472000, while the sum is 55.

The spelling of 255643494544 in words is "two hundred fifty-five billion, six hundred forty-three million, four hundred ninety-four thousand, five hundred forty-four".