12555243761 has 4 divisors (see below), whose sum is σ = 12555785124. Its totient is φ = 12554702400.

The previous prime is 12555243721. The next prime is 12555243787. The reversal of 12555243761 is 16734255521.

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 11658600625 + 896643136 = 107975^2 + 29944^2 .

It is a cyclic number.

It is not a de Polignac number, because 12555243761 - 2⁶ = 12555243697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12555243721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 234260 + ... + 282821.

It is an arithmetic number, because the mean of its divisors is an integer number (3138946281).

Almost surely, 2^12555243761 is an apocalyptic number.

It is an amenable number.

12555243761 is a deficient number, since it is larger than the sum of its proper divisors (541363).

12555243761 is an equidigital number, since it uses as much as digits as its factorization.

12555243761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 541362.

The product of its digits is 252000, while the sum is 41.

The spelling of 12555243761 in words is "twelve billion, five hundred fifty-five million, two hundred forty-three thousand, seven hundred sixty-one".