12699126678 has 32 divisors (see below), whose sum is σ = 29030895360. Its totient is φ = 3627781920.

The previous prime is 12699126673. The next prime is 12699126697. The reversal of 12699126678 is 87662199621.

It is a super-2 number, since 2×12699126678² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12699126673) 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, 326893 + ... + 363671.

It is an arithmetic number, because the mean of its divisors is an integer number (907215480).

Almost surely, 2^12699126678 is an apocalyptic number.

12699126678 is an abundant number, since it is smaller than the sum of its proper divisors (16331768682).

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

12699126678 is a wasteful number, since it uses less digits than its factorization.

12699126678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45012.

The product of its digits is 3919104, while the sum is 57.

The spelling of 12699126678 in words is "twelve billion, six hundred ninety-nine million, one hundred twenty-six thousand, six hundred seventy-eight".