12918636554 has 16 divisors (see below), whose sum is σ = 20049270120. Its totient is φ = 6235615680.

The previous prime is 12918636539. The next prime is 12918636559. The reversal of 12918636554 is 45563681921.

It can be written as a sum of positive squares in 4 ways, for example, as 10445862025 + 2472774529 = 102205^2 + 49727^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12918636559) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 484244 + ... + 510224.

Almost surely, 2^12918636554 is an apocalyptic number.

12918636554 is a deficient number, since it is larger than the sum of its proper divisors (7130633566).

12918636554 is a wasteful number, since it uses less digits than its factorization.

12918636554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34585.

The product of its digits is 1555200, while the sum is 50.

The spelling of 12918636554 in words is "twelve billion, nine hundred eighteen million, six hundred thirty-six thousand, five hundred fifty-four".