255566369 has 4 divisors (see below), whose sum is σ = 255640644. Its totient is φ = 255492096.

The previous prime is 255566323. The next prime is 255566383. The reversal of 255566369 is 963665552.

255566369 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 107019025 + 148547344 = 10345^2 + 12188^2 .

It is a cyclic number.

It is not a de Polignac number, because 255566369 - 2¹² = 255562273 is a prime.

It is a super-2 number, since 2×255566369² = 130628337927688322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255566669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31712 + ... + 38945.

It is an arithmetic number, because the mean of its divisors is an integer number (63910161).

Almost surely, 2^255566369 is an apocalyptic number.

It is an amenable number.

255566369 is a deficient number, since it is larger than the sum of its proper divisors (74275).

255566369 is an equidigital number, since it uses as much as digits as its factorization.

255566369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74274.

The product of its digits is 1458000, while the sum is 47.

The square root of 255566369 is about 15986.4432879862. The cubic root of 255566369 is about 634.6017044704.

The spelling of 255566369 in words is "two hundred fifty-five million, five hundred sixty-six thousand, three hundred sixty-nine".