12645837979 has 2 divisors, whose sum is σ = 12645837980. Its totient is φ = 12645837978.

The previous prime is 12645837977. The next prime is 12645838013. The reversal of 12645837979 is 97973854621.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12645837979 - 2¹ = 12645837977 is a prime.

It is a super-2 number, since 2×12645837979² (a number of 21 digits) contains 22 as substring.

Together with 12645837977, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (12645837973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6322918989 + 6322918990.

It is an arithmetic number, because the mean of its divisors is an integer number (6322918990).

Almost surely, 2^12645837979 is an apocalyptic number.

12645837979 is a deficient number, since it is larger than the sum of its proper divisors (1).

12645837979 is an equidigital number, since it uses as much as digits as its factorization.

12645837979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22861440, while the sum is 61.

The spelling of 12645837979 in words is "twelve billion, six hundred forty-five million, eight hundred thirty-seven thousand, nine hundred seventy-nine".