255997555 has 16 divisors (see below), whose sum is σ = 336328704. Its totient is φ = 185510880.

The previous prime is 255997523. The next prime is 255997589. The reversal of 255997555 is 555799552.

It is not a de Polignac number, because 255997555 - 2⁵ = 255997523 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7342 + ... + 23788.

It is an arithmetic number, because the mean of its divisors is an integer number (21020544).

Almost surely, 2^255997555 is an apocalyptic number.

255997555 is a deficient number, since it is larger than the sum of its proper divisors (80331149).

255997555 is a wasteful number, since it uses less digits than its factorization.

255997555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16746.

The product of its digits is 3543750, while the sum is 52.

The square root of 255997555 is about 15999.9235935676. The cubic root of 255997555 is about 634.9583993248.

The spelling of 255997555 in words is "two hundred fifty-five million, nine hundred ninety-seven thousand, five hundred fifty-five".