13638551511 has 16 divisors (see below), whose sum is σ = 19646146016. Its totient is φ = 8366132736.

The previous prime is 13638551503. The next prime is 13638551513. The reversal of 13638551511 is 11515583631.

It is not a de Polignac number, because 13638551511 - 2³ = 13638551503 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13638551511.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13638551513) 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, 546430 + ... + 570843.

It is an arithmetic number, because the mean of its divisors is an integer number (1227884126).

Almost surely, 2^13638551511 is an apocalyptic number.

13638551511 is a deficient number, since it is larger than the sum of its proper divisors (6007594505).

13638551511 is a wasteful number, since it uses less digits than its factorization.

13638551511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1117602.

The product of its digits is 54000, while the sum is 39.

The spelling of 13638551511 in words is "thirteen billion, six hundred thirty-eight million, five hundred fifty-one thousand, five hundred eleven".