255553999 has 4 divisors (see below), whose sum is σ = 255616936. Its totient is φ = 255491064.

The previous prime is 255553981. The next prime is 255554011. The reversal of 255553999 is 999355552.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 255553999 - 2⁷ = 255553871 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 (255551999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24924 + ... + 33649.

It is an arithmetic number, because the mean of its divisors is an integer number (63904234).

Almost surely, 2^255553999 is an apocalyptic number.

255553999 is a deficient number, since it is larger than the sum of its proper divisors (62937).

255553999 is an equidigital number, since it uses as much as digits as its factorization.

255553999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62936.

The product of its digits is 2733750, while the sum is 52.

The square root of 255553999 is about 15986.0563929945. The cubic root of 255553999 is about 634.5914655779.

The spelling of 255553999 in words is "two hundred fifty-five million, five hundred fifty-three thousand, nine hundred ninety-nine".