12507805136 has 20 divisors (see below), whose sum is σ = 24262309092. Its totient is φ = 6246564096.

The previous prime is 12507805069. The next prime is 12507805147. The reversal of 12507805136 is 63150870521.

It can be written as a sum of positive squares in 2 ways, for example, as 5461210000 + 7046595136 = 73900^2 + 83944^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 12507805136.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 444581 + ... + 471876.

Almost surely, 2^12507805136 is an apocalyptic number.

12507805136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12507805136 is a deficient number, since it is larger than the sum of its proper divisors (11754503956).

12507805136 is an equidigital number, since it uses as much as digits as its factorization.

12507805136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 917318 (or 917312 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 38.

The spelling of 12507805136 in words is "twelve billion, five hundred seven million, eight hundred five thousand, one hundred thirty-six".