255666681289 has 2 divisors, whose sum is σ = 255666681290. Its totient is φ = 255666681288.

The previous prime is 255666681241. The next prime is 255666681301. The reversal of 255666681289 is 982186666552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 222791552064 + 32875129225 = 472008^2 + 181315^2 .

It is a cyclic number.

It is not a de Polignac number, because 255666681289 - 2³⁵ = 221306942921 is a prime.

It is a super-2 number, since 2×255666681289² (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 255666681289.

It is not a weakly prime, because it can be changed into another prime (255666681089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127833340644 + 127833340645.

It is an arithmetic number, because the mean of its divisors is an integer number (127833340645).

Almost surely, 2^255666681289 is an apocalyptic number.

It is an amenable number.

255666681289 is a deficient number, since it is larger than the sum of its proper divisors (1).

255666681289 is an equidigital number, since it uses as much as digits as its factorization.

255666681289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 74649600, while the sum is 64.

The spelling of 255666681289 in words is "two hundred fifty-five billion, six hundred sixty-six million, six hundred eighty-one thousand, two hundred eighty-nine".