12555031277 has 4 divisors (see below), whose sum is σ = 12987963420. Its totient is φ = 12122099136.

The previous prime is 12555031249. The next prime is 12555031331. The reversal of 12555031277 is 77213055521.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5756863876 + 6798167401 = 75874^2 + 82451^2 .

It is a cyclic number.

It is not a de Polignac number, because 12555031277 - 2¹⁰ = 12555030253 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12555031277.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12555031477) 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, 216466028 + ... + 216466085.

It is an arithmetic number, because the mean of its divisors is an integer number (3246990855).

Almost surely, 2^12555031277 is an apocalyptic number.

It is an amenable number.

12555031277 is a deficient number, since it is larger than the sum of its proper divisors (432932143).

12555031277 is an equidigital number, since it uses as much as digits as its factorization.

12555031277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432932142.

The product of its (nonzero) digits is 73500, while the sum is 38.

Adding to 12555031277 its reverse (77213055521), we get a palindrome (89768086798).

The spelling of 12555031277 in words is "twelve billion, five hundred fifty-five million, thirty-one thousand, two hundred seventy-seven".