255905997 has 8 divisors (see below), whose sum is σ = 342673344. Its totient is φ = 169871328.

The previous prime is 255905989. The next prime is 255906017. The reversal of 255905997 is 799509552.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 255905997 - 2³ = 255905989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255905917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 182353 + ... + 183750.

It is an arithmetic number, because the mean of its divisors is an integer number (42834168).

Almost surely, 2^255905997 is an apocalyptic number.

It is an amenable number.

255905997 is a deficient number, since it is larger than the sum of its proper divisors (86767347).

255905997 is a wasteful number, since it uses less digits than its factorization.

255905997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366339.

The product of its (nonzero) digits is 1275750, while the sum is 51.

The square root of 255905997 is about 15997.0621365299. The cubic root of 255905997 is about 634.8826922824.

The spelling of 255905997 in words is "two hundred fifty-five million, nine hundred five thousand, nine hundred ninety-seven".