12636981953 has 4 divisors (see below), whose sum is σ = 12637255380. Its totient is φ = 12636708528.

The previous prime is 12636981937. The next prime is 12636981983. The reversal of 12636981953 is 35918963621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35918963621 = 17 ⋅2112880213.

It can be written as a sum of positive squares in 2 ways, for example, as 22771984 + 12614209969 = 4772^2 + 112313^2 .

It is a cyclic number.

It is not a de Polignac number, because 12636981953 - 2⁴ = 12636981937 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12636981895 and 12636981904.

It is not an unprimeable number, because it can be changed into a prime (12636981983) 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, 48350 + ... + 166167.

It is an arithmetic number, because the mean of its divisors is an integer number (3159313845).

Almost surely, 2^12636981953 is an apocalyptic number.

It is an amenable number.

12636981953 is a deficient number, since it is larger than the sum of its proper divisors (273427).

12636981953 is an equidigital number, since it uses as much as digits as its factorization.

12636981953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273426.

The product of its digits is 2099520, while the sum is 53.

The spelling of 12636981953 in words is "twelve billion, six hundred thirty-six million, nine hundred eighty-one thousand, nine hundred fifty-three".