12511678938 has 64 divisors (see below), whose sum is σ = 29064147840. Its totient is φ = 3548620800.

The previous prime is 12511678937. The next prime is 12511678987. The reversal of 12511678938 is 83987611521.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (12511678937) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 172278 + ... + 233886.

It is an arithmetic number, because the mean of its divisors is an integer number (454127310).

Almost surely, 2^12511678938 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12511678938, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14532073920).

12511678938 is an abundant number, since it is smaller than the sum of its proper divisors (16552468902).

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

12511678938 is a wasteful number, since it uses less digits than its factorization.

12511678938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61823.

The product of its digits is 725760, while the sum is 51.

The spelling of 12511678938 in words is "twelve billion, five hundred eleven million, six hundred seventy-eight thousand, nine hundred thirty-eight".