255840769297 has 4 divisors (see below), whose sum is σ = 264662864820. Its totient is φ = 247018673776.

The previous prime is 255840769277. The next prime is 255840769337. The reversal of 255840769297 is 792967048552.

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 126856356561 + 128984412736 = 356169^2 + 359144^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-255840769297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255840769207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4411047718 + ... + 4411047775.

It is an arithmetic number, because the mean of its divisors is an integer number (66165716205).

Almost surely, 2^255840769297 is an apocalyptic number.

It is an amenable number.

255840769297 is a deficient number, since it is larger than the sum of its proper divisors (8822095523).

255840769297 is an equidigital number, since it uses as much as digits as its factorization.

255840769297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8822095522.

The product of its (nonzero) digits is 76204800, while the sum is 64.

The spelling of 255840769297 in words is "two hundred fifty-five billion, eight hundred forty million, seven hundred sixty-nine thousand, two hundred ninety-seven".