12500013888 has 42 divisors (see below), whose sum is σ = 35829034514. Its totient is φ = 4166671104.

The previous prime is 12500013853. The next prime is 12500013913. The reversal of 12500013888 is 88831000521.

12500013888 is a `hidden beast` number, since 12 + 500 + 0 + 138 + 8 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 7291793664 + 5208220224 = 85392^2 + 72168^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10850131 + ... + 10851282.

Almost surely, 2^12500013888 is an apocalyptic number.

12500013888 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

12500013888 is an abundant number, since it is smaller than the sum of its proper divisors (23329020626).

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

12500013888 is a wasteful number, since it uses less digits than its factorization.

12500013888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21701431 (or 21701418 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 36.

The spelling of 12500013888 in words is "twelve billion, five hundred million, thirteen thousand, eight hundred eighty-eight".