255603553 has 4 divisors (see below), whose sum is σ = 261837828. Its totient is φ = 249369280.

The previous prime is 255603547. The next prime is 255603571. The reversal of 255603553 is 355306552.

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 25080064 + 230523489 = 5008^2 + 15183^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-255603553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255604553) 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, 3117076 + ... + 3117157.

It is an arithmetic number, because the mean of its divisors is an integer number (65459457).

Almost surely, 2^255603553 is an apocalyptic number.

It is an amenable number.

255603553 is a deficient number, since it is larger than the sum of its proper divisors (6234275).

255603553 is an equidigital number, since it uses as much as digits as its factorization.

255603553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6234274.

The product of its (nonzero) digits is 67500, while the sum is 34.

The square root of 255603553 is about 15987.6062310779. The cubic root of 255603553 is about 634.6324804101.

The spelling of 255603553 in words is "two hundred fifty-five million, six hundred three thousand, five hundred fifty-three".