13125636643 has 4 divisors (see below), whose sum is σ = 15000727600. Its totient is φ = 11250545688.

The previous prime is 13125636637. The next prime is 13125636673. The reversal of 13125636643 is 34663652131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34663652131 = 37 ⋅936855463.

It is a cyclic number.

It is not a de Polignac number, because 13125636643 - 2²¹ = 13123539491 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13125636596 and 13125636605.

It is not an unprimeable number, because it can be changed into a prime (13125636673) 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, 937545468 + ... + 937545481.

It is an arithmetic number, because the mean of its divisors is an integer number (3750181900).

Almost surely, 2^13125636643 is an apocalyptic number.

13125636643 is a deficient number, since it is larger than the sum of its proper divisors (1875090957).

13125636643 is an equidigital number, since it uses as much as digits as its factorization.

13125636643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1875090956.

The product of its digits is 233280, while the sum is 40.

The spelling of 13125636643 in words is "thirteen billion, one hundred twenty-five million, six hundred thirty-six thousand, six hundred forty-three".