12756632789 has 2 divisors, whose sum is σ = 12756632790. Its totient is φ = 12756632788.

The previous prime is 12756632767. The next prime is 12756632809. The reversal of 12756632789 is 98723665721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12505948900 + 250683889 = 111830^2 + 15833^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12756632789 is a prime.

It is a super-2 number, since 2×12756632789² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12756632719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6378316394 + 6378316395.

It is an arithmetic number, because the mean of its divisors is an integer number (6378316395).

Almost surely, 2^12756632789 is an apocalyptic number.

It is an amenable number.

12756632789 is a deficient number, since it is larger than the sum of its proper divisors (1).

12756632789 is an equidigital number, since it uses as much as digits as its factorization.

12756632789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7620480, while the sum is 56.

The spelling of 12756632789 in words is "twelve billion, seven hundred fifty-six million, six hundred thirty-two thousand, seven hundred eighty-nine".