12640556811 has 8 divisors (see below), whose sum is σ = 16939630224. Its totient is φ = 8384260640.

The previous prime is 12640556779. The next prime is 12640556837. The reversal of 12640556811 is 11865504621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12640556811 - 2⁵ = 12640556779 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12640556811.

It is not an unprimeable number, because it can be changed into a prime (12640556111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10693620 + ... + 10694801.

It is an arithmetic number, because the mean of its divisors is an integer number (2117453778).

Almost surely, 2^12640556811 is an apocalyptic number.

12640556811 is a deficient number, since it is larger than the sum of its proper divisors (4299073413).

12640556811 is a wasteful number, since it uses less digits than its factorization.

12640556811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21388621.

The product of its (nonzero) digits is 57600, while the sum is 39.

The spelling of 12640556811 in words is "twelve billion, six hundred forty million, five hundred fifty-six thousand, eight hundred eleven".