255866493 has 4 divisors (see below), whose sum is σ = 341155328. Its totient is φ = 170577660.

The previous prime is 255866477. The next prime is 255866497. The reversal of 255866493 is 394668552.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 255866493 - 2⁴ = 255866477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255866497) 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, 42644413 + ... + 42644418.

It is an arithmetic number, because the mean of its divisors is an integer number (85288832).

Almost surely, 2^255866493 is an apocalyptic number.

It is an amenable number.

255866493 is a deficient number, since it is larger than the sum of its proper divisors (85288835).

255866493 is an equidigital number, since it uses as much as digits as its factorization.

255866493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85288834.

The product of its digits is 1555200, while the sum is 48.

The square root of 255866493 is about 15995.8273621592. The cubic root of 255866493 is about 634.8500218268.

The spelling of 255866493 in words is "two hundred fifty-five million, eight hundred sixty-six thousand, four hundred ninety-three".