255550553 has 4 divisors (see below), whose sum is σ = 255861888. Its totient is φ = 255239220.

The previous prime is 255550549. The next prime is 255550573. The reversal of 255550553 is 355055552.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 255550553 - 2² = 255550549 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255550573) 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, 154433 + ... + 156078.

It is an arithmetic number, because the mean of its divisors is an integer number (63965472).

Almost surely, 2^255550553 is an apocalyptic number.

It is an amenable number.

255550553 is a deficient number, since it is larger than the sum of its proper divisors (311335).

255550553 is an equidigital number, since it uses as much as digits as its factorization.

255550553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311334.

The product of its (nonzero) digits is 93750, while the sum is 35.

The square root of 255550553 is about 15985.9486112023. The cubic root of 255550553 is about 634.5886131970.

The spelling of 255550553 in words is "two hundred fifty-five million, five hundred fifty thousand, five hundred fifty-three".