13638863650 has 24 divisors (see below), whose sum is σ = 25846938324. Its totient is φ = 5352609600.

The previous prime is 13638863617. The next prime is 13638863657. The reversal of 13638863650 is 5636883631.

It can be written as a sum of positive squares in 6 ways, for example, as 6588406561 + 7050457089 = 81169^2 + 83967^2 .

It is a super-3 number, since 3×13638863650³ (a number of 31 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 13638863594 and 13638863603.

It is not an unprimeable number, because it can be changed into a prime (13638863657) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2570721 + ... + 2576020.

Almost surely, 2^13638863650 is an apocalyptic number.

13638863650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

13638863650 is a deficient number, since it is larger than the sum of its proper divisors (12208074674).

13638863650 is a wasteful number, since it uses less digits than its factorization.

13638863650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5146806 (or 5146801 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 49.

The spelling of 13638863650 in words is "thirteen billion, six hundred thirty-eight million, eight hundred sixty-three thousand, six hundred fifty".