5255661321 has 16 divisors (see below), whose sum is σ = 7803220800. Its totient is φ = 3496099104.

The previous prime is 5255661319. The next prime is 5255661347. The reversal of 5255661321 is 1231665525.

5255661321 is a `hidden beast` number, since 525 + 56 + 61 + 3 + 21 = 666.

It is not a de Polignac number, because 5255661321 - 2¹ = 5255661319 is a prime.

It is not an unprimeable number, because it can be changed into a prime (5255661371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 200631 + ... + 225308.

It is an arithmetic number, because the mean of its divisors is an integer number (487701300).

Almost surely, 2^5255661321 is an apocalyptic number.

It is an amenable number.

5255661321 is a deficient number, since it is larger than the sum of its proper divisors (2547559479).

5255661321 is a wasteful number, since it uses less digits than its factorization.

5255661321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426405 (or 426399 counting only the distinct ones).

The product of its digits is 54000, while the sum is 36.

The square root of 5255661321 is about 72495.9400311493. The cubic root of 5255661321 is about 1738.6378250881.

The spelling of 5255661321 in words is "five billion, two hundred fifty-five million, six hundred sixty-one thousand, three hundred twenty-one".