255567851321 has 2 divisors, whose sum is σ = 255567851322. Its totient is φ = 255567851320.

The previous prime is 255567851303. The next prime is 255567851333. The reversal of 255567851321 is 123158765552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 189729936400 + 65837914921 = 435580^2 + 256589^2 .

It is a cyclic number.

It is not a de Polignac number, because 255567851321 - 2¹⁴ = 255567834937 is a prime.

It is a super-2 number, since 2×255567851321² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 255567851321.

It is not a weakly prime, because it can be changed into another prime (255567851521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127783925660 + 127783925661.

It is an arithmetic number, because the mean of its divisors is an integer number (127783925661).

Almost surely, 2^255567851321 is an apocalyptic number.

It is an amenable number.

255567851321 is a deficient number, since it is larger than the sum of its proper divisors (1).

255567851321 is an equidigital number, since it uses as much as digits as its factorization.

255567851321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2520000, while the sum is 50.

The spelling of 255567851321 in words is "two hundred fifty-five billion, five hundred sixty-seven million, eight hundred fifty-one thousand, three hundred twenty-one".