255535551 has 48 divisors (see below), whose sum is σ = 401454144. Its totient is φ = 156045312.

The previous prime is 255535537. The next prime is 255535591. The reversal of 255535551 is 155535552.

255535551 is a `hidden beast` number, since 2 + 5 + 553 + 55 + 51 = 666.

It is not a de Polignac number, because 255535551 - 2⁶ = 255535487 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255535531) 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 47 ways as a sum of consecutive naturals, for example, 1530070 + ... + 1530236.

It is an arithmetic number, because the mean of its divisors is an integer number (8363628).

Almost surely, 2^255535551 is an apocalyptic number.

255535551 is a deficient number, since it is larger than the sum of its proper divisors (145918593).

255535551 is a wasteful number, since it uses less digits than its factorization.

255535551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400 (or 397 counting only the distinct ones).

The product of its digits is 93750, while the sum is 36.

The square root of 255535551 is about 15985.4793797371. The cubic root of 255535551 is about 634.5761951913.

Subtracting from 255535551 its reverse (155535552), we obtain a palindrome (99999999).

The spelling of 255535551 in words is "two hundred fifty-five million, five hundred thirty-five thousand, five hundred fifty-one".