12640556810 has 32 divisors (see below), whose sum is σ = 26013156480. Its totient is φ = 4332284352.

The previous prime is 12640556779. The next prime is 12640556837. The reversal of 12640556810 is 1865504621.

It is a happy number.

It is a super-2 number, since 2×12640556810² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 162857 + ... + 227603.

It is an arithmetic number, because the mean of its divisors is an integer number (812911140).

Almost surely, 2^12640556810 is an apocalyptic number.

12640556810 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12640556810 is an abundant number, since it is smaller than the sum of its proper divisors (13372599670).

12640556810 is a wasteful number, since it uses less digits than its factorization.

12640556810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67550.

The product of its (nonzero) digits is 57600, while the sum is 38.

The spelling of 12640556810 in words is "twelve billion, six hundred forty million, five hundred fifty-six thousand, eight hundred ten".