255669421 has 8 divisors (see below), whose sum is σ = 292616064. Its totient is φ = 218828400.

The previous prime is 255669397. The next prime is 255669451. The reversal of 255669421 is 124966552.

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

It is not a de Polignac number, because 255669421 - 2⁹ = 255668909 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 (255669451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21145 + ... + 30958.

It is an arithmetic number, because the mean of its divisors is an integer number (36577008).

Almost surely, 2^255669421 is an apocalyptic number.

It is an amenable number.

255669421 is a deficient number, since it is larger than the sum of its proper divisors (36946643).

255669421 is an equidigital number, since it uses as much as digits as its factorization.

255669421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52811.

The product of its digits is 129600, while the sum is 40.

The square root of 255669421 is about 15989.6660690585. Note that the first 3 decimals coincide. The cubic root of 255669421 is about 634.6869898010.

The spelling of 255669421 in words is "two hundred fifty-five million, six hundred sixty-nine thousand, four hundred twenty-one".