13638334381 has 16 divisors (see below), whose sum is σ = 15958835200. Its totient is φ = 11411206128.

The previous prime is 13638334379. The next prime is 13638334399. The reversal of 13638334381 is 18343383631.

It is not a de Polignac number, because 13638334381 - 2¹ = 13638334379 is a prime.

It is a super-2 number, since 2×13638334381² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13638334321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 516580 + ... + 542338.

It is an arithmetic number, because the mean of its divisors is an integer number (997427200).

Almost surely, 2^13638334381 is an apocalyptic number.

It is an amenable number.

13638334381 is a deficient number, since it is larger than the sum of its proper divisors (2320500819).

13638334381 is a wasteful number, since it uses less digits than its factorization.

13638334381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27568.

The product of its digits is 373248, while the sum is 43.

The spelling of 13638334381 in words is "thirteen billion, six hundred thirty-eight million, three hundred thirty-four thousand, three hundred eighty-one".