12641690438 has 24 divisors (see below), whose sum is σ = 20822638896. Its totient is φ = 5752437600.

The previous prime is 12641690431. The next prime is 12641690459. The reversal of 12641690438 is 83409614621.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12641690431) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 239393 + ... + 287388.

It is an arithmetic number, because the mean of its divisors is an integer number (867609954).

Almost surely, 2^12641690438 is an apocalyptic number.

12641690438 is a deficient number, since it is larger than the sum of its proper divisors (8180948458).

12641690438 is a wasteful number, since it uses less digits than its factorization.

12641690438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526880 (or 526867 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 44.

The spelling of 12641690438 in words is "twelve billion, six hundred forty-one million, six hundred ninety thousand, four hundred thirty-eight".