255466721 has 4 divisors (see below), whose sum is σ = 256110612. Its totient is φ = 254822832.

The previous prime is 255466711. The next prime is 255466763. The reversal of 255466721 is 127664552.

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 229098496 + 26368225 = 15136^2 + 5135^2 .

It is a cyclic number.

It is not a de Polignac number, because 255466721 - 2⁶ = 255466657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255466711) 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, 321350 + ... + 322143.

It is an arithmetic number, because the mean of its divisors is an integer number (64027653).

Almost surely, 2^255466721 is an apocalyptic number.

It is an amenable number.

255466721 is a deficient number, since it is larger than the sum of its proper divisors (643891).

255466721 is an equidigital number, since it uses as much as digits as its factorization.

255466721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 643890.

The product of its digits is 100800, while the sum is 38.

The square root of 255466721 is about 15983.3263434117. The cubic root of 255466721 is about 634.5192144678.

The spelling of 255466721 in words is "two hundred fifty-five million, four hundred sixty-six thousand, seven hundred twenty-one".