1338535431818 has 16 divisors (see below), whose sum is σ = 2203046707176. Its totient is φ = 606129251520.

The previous prime is 1338535431799. The next prime is 1338535431859. The reversal of 1338535431818 is 8181345358331.

It can be written as a sum of positive squares in 4 ways, for example, as 1218235365169 + 120300066649 = 1103737^2 + 346843^2 .

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a self number, because there is not a number n which added to its sum of digits gives 1338535431818.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 485679113 + ... + 485681868.

Almost surely, 2^{1338535431818} is an apocalyptic number.

1338535431818 is a deficient number, since it is larger than the sum of its proper divisors (864511275358).

1338535431818 is a wasteful number, since it uses less digits than its factorization.

1338535431818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 971361049.

The product of its digits is 4147200, while the sum is 53.

The spelling of 1338535431818 in words is "one trillion, three hundred thirty-eight billion, five hundred thirty-five million, four hundred thirty-one thousand, eight hundred eighteen".