12640402211 has 2 divisors, whose sum is σ = 12640402212. Its totient is φ = 12640402210.

The previous prime is 12640402193. The next prime is 12640402277. The reversal of 12640402211 is 11220404621.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12640402211 - 2⁶ = 12640402147 is a prime.

It is not a weakly prime, because it can be changed into another prime (12640402111) by changing a digit.

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 as a sum of consecutive naturals, namely, 6320201105 + 6320201106.

It is an arithmetic number, because the mean of its divisors is an integer number (6320201106).

Almost surely, 2^12640402211 is an apocalyptic number.

12640402211 is a deficient number, since it is larger than the sum of its proper divisors (1).

12640402211 is an equidigital number, since it uses as much as digits as its factorization.

12640402211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 12640402211 its reverse (11220404621), we get a palindrome (23860806832).

The spelling of 12640402211 in words is "twelve billion, six hundred forty million, four hundred two thousand, two hundred eleven".