12964827581 has 2 divisors, whose sum is σ = 12964827582. Its totient is φ = 12964827580.

The previous prime is 12964827571. The next prime is 12964827613. The reversal of 12964827581 is 18572846921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7424407225 + 5540420356 = 86165^2 + 74434^2 .

It is a cyclic number.

It is not a de Polignac number, because 12964827581 - 2¹⁸ = 12964565437 is a prime.

It is a super-2 number, since 2×12964827581² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12964827571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6482413790 + 6482413791.

It is an arithmetic number, because the mean of its divisors is an integer number (6482413791).

Almost surely, 2^12964827581 is an apocalyptic number.

It is an amenable number.

12964827581 is a deficient number, since it is larger than the sum of its proper divisors (1).

12964827581 is an equidigital number, since it uses as much as digits as its factorization.

12964827581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1935360, while the sum is 53.

The spelling of 12964827581 in words is "twelve billion, nine hundred sixty-four million, eight hundred twenty-seven thousand, five hundred eighty-one".