13263138125 has 10 divisors (see below), whose sum is σ = 16573618182. Its totient is φ = 10610510000.

The previous prime is 13263138121. The next prime is 13263138127. The reversal of 13263138125 is 52183136231.

It can be written as a sum of positive squares in 5 ways, for example, as 4670218921 + 8592919204 = 68339^2 + 92698^2 .

It is not a de Polignac number, because 13263138125 - 2² = 13263138121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13263138121) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 10609886 + ... + 10611135.

Almost surely, 2^13263138125 is an apocalyptic number.

It is an amenable number.

13263138125 is a deficient number, since it is larger than the sum of its proper divisors (3310480057).

13263138125 is an frugal number, since it uses more digits than its factorization.

13263138125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21221041 (or 21221026 counting only the distinct ones).

The product of its digits is 25920, while the sum is 35.

The spelling of 13263138125 in words is "thirteen billion, two hundred sixty-three million, one hundred thirty-eight thousand, one hundred twenty-five".