12646264681 has 2 divisors, whose sum is σ = 12646264682. Its totient is φ = 12646264680.

The previous prime is 12646264679. The next prime is 12646264699. The reversal of 12646264681 is 18646264621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10519579225 + 2126685456 = 102565^2 + 46116^2 .

It is a cyclic number.

It is not a de Polignac number, because 12646264681 - 2¹ = 12646264679 is a prime.

It is a super-2 number, since 2×12646264681² (a number of 21 digits) contains 22 as substring.

Together with 12646264679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (12646264381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6323132340 + 6323132341.

It is an arithmetic number, because the mean of its divisors is an integer number (6323132341).

Almost surely, 2^12646264681 is an apocalyptic number.

It is an amenable number.

12646264681 is a deficient number, since it is larger than the sum of its proper divisors (1).

12646264681 is an equidigital number, since it uses as much as digits as its factorization.

12646264681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 663552, while the sum is 46.

The spelling of 12646264681 in words is "twelve billion, six hundred forty-six million, two hundred sixty-four thousand, six hundred eighty-one".