255815561449 has 4 divisors (see below), whose sum is σ = 292360641664. Its totient is φ = 219270481236.

The previous prime is 255815561437. The next prime is 255815561459. The reversal of 255815561449 is 944165518552.

It is a happy number.

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 255815561449 - 2²⁷ = 255681343721 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 255815561449.

It is not an unprimeable number, because it can be changed into a prime (255815561459) 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, 18272540097 + ... + 18272540110.

It is an arithmetic number, because the mean of its divisors is an integer number (73090160416).

Almost surely, 2^255815561449 is an apocalyptic number.

It is an amenable number.

255815561449 is a deficient number, since it is larger than the sum of its proper divisors (36545080215).

255815561449 is an equidigital number, since it uses as much as digits as its factorization.

255815561449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36545080214.

The product of its digits is 8640000, while the sum is 55.

The spelling of 255815561449 in words is "two hundred fifty-five billion, eight hundred fifteen million, five hundred sixty-one thousand, four hundred forty-nine".