12551868865 has 4 divisors (see below), whose sum is σ = 15062242644. Its totient is φ = 10041495088.

The previous prime is 12551868853. The next prime is 12551868869. The reversal of 12551868865 is 56886815521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56886815521 = 331 ⋅171863491.

It can be written as a sum of positive squares in 2 ways, for example, as 7441477696 + 5110391169 = 86264^2 + 71487^2 .

It is a cyclic number.

It is not a de Polignac number, because 12551868865 - 2¹⁵ = 12551836097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12551868869) 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, 1255186882 + ... + 1255186891.

It is an arithmetic number, because the mean of its divisors is an integer number (3765560661).

Almost surely, 2^12551868865 is an apocalyptic number.

It is an amenable number.

12551868865 is a deficient number, since it is larger than the sum of its proper divisors (2510373779).

12551868865 is an equidigital number, since it uses as much as digits as its factorization.

12551868865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2510373778.

The product of its digits is 4608000, while the sum is 55.

The spelling of 12551868865 in words is "twelve billion, five hundred fifty-one million, eight hundred sixty-eight thousand, eight hundred sixty-five".