12639203109 has 24 divisors (see below), whose sum is σ = 19804518552. Its totient is φ = 7721187840.

The previous prime is 12639203069. The next prime is 12639203113. The reversal of 12639203109 is 90130293621.

It is a happy number.

12639203109 is a `hidden beast` number, since 1 + 2 + 639 + 2 + 0 + 3 + 10 + 9 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1926332100 + 10712871009 = 43890^2 + 103503^2 .

It is not a de Polignac number, because 12639203109 - 2¹⁷ = 12639072037 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12639203149) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 378232 + ... + 410289.

It is an arithmetic number, because the mean of its divisors is an integer number (825188273).

Almost surely, 2^12639203109 is an apocalyptic number.

It is an amenable number.

12639203109 is a deficient number, since it is larger than the sum of its proper divisors (7165315443).

12639203109 is a wasteful number, since it uses less digits than its factorization.

12639203109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 788677 (or 788674 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The spelling of 12639203109 in words is "twelve billion, six hundred thirty-nine million, two hundred three thousand, one hundred nine".