13509863402 has 24 divisors (see below), whose sum is σ = 23838217380. Its totient is φ = 5724882240.

The previous prime is 13509863387. The next prime is 13509863443. The reversal of 13509863402 is 20436890531.

It can be written as a sum of positive squares in 2 ways, for example, as 13367753161 + 142110241 = 115619^2 + 11921^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 13509863402.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 765749 + ... + 783192.

Almost surely, 2^13509863402 is an apocalyptic number.

13509863402 is a deficient number, since it is larger than the sum of its proper divisors (10328353978).

13509863402 is a wasteful number, since it uses less digits than its factorization.

13509863402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1549046 (or 1549039 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 41.

The spelling of 13509863402 in words is "thirteen billion, five hundred nine million, eight hundred sixty-three thousand, four hundred two".