12626205991 has 4 divisors (see below), whose sum is σ = 14429949712. Its totient is φ = 10822462272.

The previous prime is 12626205989. The next prime is 12626206001. The reversal of 12626205991 is 19950262621.

12626205991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 12626205991 - 2¹ = 12626205989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12626205901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 901871850 + ... + 901871863.

It is an arithmetic number, because the mean of its divisors is an integer number (3607487428).

Almost surely, 2^12626205991 is an apocalyptic number.

12626205991 is a deficient number, since it is larger than the sum of its proper divisors (1803743721).

12626205991 is an equidigital number, since it uses as much as digits as its factorization.

12626205991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1803743720.

The product of its (nonzero) digits is 116640, while the sum is 43.

The spelling of 12626205991 in words is "twelve billion, six hundred twenty-six million, two hundred five thousand, nine hundred ninety-one".