12329640781 has 2 divisors, whose sum is σ = 12329640782. Its totient is φ = 12329640780.

The previous prime is 12329640601. The next prime is 12329640811. The reversal of 12329640781 is 18704692321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6669335556 + 5660305225 = 81666^2 + 75235^2 .

It is a cyclic number.

It is not a de Polignac number, because 12329640781 - 2²¹ = 12327543629 is a prime.

It is a super-2 number, since 2×12329640781² (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 (12329646781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6164820390 + 6164820391.

It is an arithmetic number, because the mean of its divisors is an integer number (6164820391).

Almost surely, 2^12329640781 is an apocalyptic number.

It is an amenable number.

12329640781 is a deficient number, since it is larger than the sum of its proper divisors (1).

12329640781 is an equidigital number, since it uses as much as digits as its factorization.

12329640781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 43.

The spelling of 12329640781 in words is "twelve billion, three hundred twenty-nine million, six hundred forty thousand, seven hundred eighty-one".