255721955 has 4 divisors (see below), whose sum is σ = 306866352. Its totient is φ = 204577560.

The previous prime is 255721951. The next prime is 255722011. The reversal of 255721955 is 559127552.

It is a happy number.

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

It is not a de Polignac number, because 255721955 - 2² = 255721951 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (255721951) 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, 25572191 + ... + 25572200.

It is an arithmetic number, because the mean of its divisors is an integer number (76716588).

Almost surely, 2^255721955 is an apocalyptic number.

255721955 is a deficient number, since it is larger than the sum of its proper divisors (51144397).

255721955 is an equidigital number, since it uses as much as digits as its factorization.

255721955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51144396.

The product of its digits is 157500, while the sum is 41.

The square root of 255721955 is about 15991.3087331838. The cubic root of 255721955 is about 634.7304578632.

The spelling of 255721955 in words is "two hundred fifty-five million, seven hundred twenty-one thousand, nine hundred fifty-five".