12639026500 has 48 divisors (see below), whose sum is σ = 28555516080. Its totient is φ = 4881273600.

The previous prime is 12639026497. The next prime is 12639026503. The reversal of 12639026500 is 562093621.

It is an interprime number because it is at equal distance from previous prime (12639026497) and next prime (12639026503).

It can be written as a sum of positive squares in 8 ways, for example, as 4321221696 + 8317804804 = 65736^2 + 91202^2 .

It is not an unprimeable number, because it can be changed into a prime (12639026503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 421329 + ... + 450328.

It is an arithmetic number, because the mean of its divisors is an integer number (594906585).

Almost surely, 2^12639026500 is an apocalyptic number.

12639026500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12639026500 is an abundant number, since it is smaller than the sum of its proper divisors (15916489580).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12639026500 is a wasteful number, since it uses less digits than its factorization.

12639026500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 871705 (or 871693 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 34.

The spelling of 12639026500 in words is "twelve billion, six hundred thirty-nine million, twenty-six thousand, five hundred".