13638022643 has 4 divisors (see below), whose sum is σ = 15586311600. Its totient is φ = 11689733688.

The previous prime is 13638022637. The next prime is 13638022679. The reversal of 13638022643 is 34622083631.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34622083631 = 23819 ⋅1453549.

It is a cyclic number.

It is not a de Polignac number, because 13638022643 - 2³⁰ = 12564280819 is a prime.

It is a super-2 number, since 2×13638022643² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13638022597 and 13638022606.

It is not an unprimeable number, because it can be changed into a prime (13638022843) 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, 974144468 + ... + 974144481.

It is an arithmetic number, because the mean of its divisors is an integer number (3896577900).

Almost surely, 2^13638022643 is an apocalyptic number.

13638022643 is a deficient number, since it is larger than the sum of its proper divisors (1948288957).

13638022643 is an equidigital number, since it uses as much as digits as its factorization.

13638022643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1948288956.

The product of its (nonzero) digits is 124416, while the sum is 38.

The spelling of 13638022643 in words is "thirteen billion, six hundred thirty-eight million, twenty-two thousand, six hundred forty-three".