255696993 has 24 divisors (see below), whose sum is σ = 383769568. Its totient is φ = 170131104.

The previous prime is 255696979. The next prime is 255696997. The reversal of 255696993 is 399696552.

255696993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 255696993 - 2⁹ = 255696481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255696997) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 227130 + ... + 228252.

Almost surely, 2^255696993 is an apocalyptic number.

It is an amenable number.

255696993 is a deficient number, since it is larger than the sum of its proper divisors (128072575).

255696993 is an equidigital number, since it uses as much as digits as its factorization.

255696993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2075 (or 2063 counting only the distinct ones).

The product of its digits is 3936600, while the sum is 54.

The square root of 255696993 is about 15990.5282276728. The cubic root of 255696993 is about 634.7098043670.

The spelling of 255696993 in words is "two hundred fifty-five million, six hundred ninety-six thousand, nine hundred ninety-three".