12641556211 has 4 divisors (see below), whose sum is σ = 12642158592. Its totient is φ = 12640953832.

The previous prime is 12641556203. The next prime is 12641556229. The reversal of 12641556211 is 11265514621.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12641556211 - 2³ = 12641556203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12641556911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 268531 + ... + 312076.

It is an arithmetic number, because the mean of its divisors is an integer number (3160539648).

Almost surely, 2^12641556211 is an apocalyptic number.

12641556211 is a deficient number, since it is larger than the sum of its proper divisors (602381).

12641556211 is an equidigital number, since it uses as much as digits as its factorization.

12641556211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 602380.

The product of its digits is 14400, while the sum is 34.

The spelling of 12641556211 in words is "twelve billion, six hundred forty-one million, five hundred fifty-six thousand, two hundred eleven".