255215512551 has 4 divisors (see below), whose sum is σ = 340287350072. Its totient is φ = 170143675032.

The previous prime is 255215512529. The next prime is 255215512577. The reversal of 255215512551 is 155215512552.

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

It is not a de Polignac number, because 255215512551 - 2⁷ = 255215512423 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 (255215516551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42535918756 + ... + 42535918761.

It is an arithmetic number, because the mean of its divisors is an integer number (85071837518).

Almost surely, 2^255215512551 is an apocalyptic number.

255215512551 is a deficient number, since it is larger than the sum of its proper divisors (85071837521).

255215512551 is an equidigital number, since it uses as much as digits as its factorization.

255215512551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85071837520.

The product of its digits is 125000, while the sum is 39.

Subtracting from 255215512551 its reverse (155215512552), we obtain a palindrome (99999999999).

The spelling of 255215512551 in words is "two hundred fifty-five billion, two hundred fifteen million, five hundred twelve thousand, five hundred fifty-one".