255688139369 has 16 divisors (see below), whose sum is σ = 277615371600. Its totient is φ = 234088308480.

The previous prime is 255688139309. The next prime is 255688139387. The reversal of 255688139369 is 963931886552.

It can be written as a sum of positive squares in 8 ways, for example, as 14886928144 + 240801211225 = 122012^2 + 490715^2 .

It is not a de Polignac number, because 255688139369 - 2¹² = 255688135273 is a prime.

It is a super-2 number, since 2×255688139369² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (255688139309) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1213859 + ... + 1408839.

It is an arithmetic number, because the mean of its divisors is an integer number (17350960725).

Almost surely, 2^255688139369 is an apocalyptic number.

It is an amenable number.

255688139369 is a deficient number, since it is larger than the sum of its proper divisors (21927232231).

255688139369 is a wasteful number, since it uses less digits than its factorization.

255688139369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195820.

The product of its digits is 83980800, while the sum is 65.

The spelling of 255688139369 in words is "two hundred fifty-five billion, six hundred eighty-eight million, one hundred thirty-nine thousand, three hundred sixty-nine".