12500000138749 has 4 divisors (see below), whose sum is σ = 12671233017436. Its totient is φ = 12328767260064.

The previous prime is 12500000138699. The next prime is 12500000138777. The reversal of 12500000138749 is 94783100000521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2939270224900 + 9560729913849 = 1714430^2 + 3092043^2 .

It is a cyclic number.

It is not a de Polignac number, because 12500000138749 - 2²⁵ = 12499966584317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12500000138849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85616439234 + ... + 85616439379.

It is an arithmetic number, because the mean of its divisors is an integer number (3167808254359).

Almost surely, 2^{12500000138749} is an apocalyptic number.

It is an amenable number.

12500000138749 is a deficient number, since it is larger than the sum of its proper divisors (171232878687).

12500000138749 is an equidigital number, since it uses as much as digits as its factorization.

12500000138749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171232878686.

The product of its (nonzero) digits is 60480, while the sum is 40.

The spelling of 12500000138749 in words is "twelve trillion, five hundred billion, one hundred thirty-eight thousand, seven hundred forty-nine".