12820990723 has 2 divisors, whose sum is σ = 12820990724. Its totient is φ = 12820990722.

The previous prime is 12820990709. The next prime is 12820990727. The reversal of 12820990723 is 32709902821.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12820990723 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12820990723.

It is not a weakly prime, because it can be changed into another prime (12820990727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6410495361 + 6410495362.

It is an arithmetic number, because the mean of its divisors is an integer number (6410495362).

Almost surely, 2^12820990723 is an apocalyptic number.

12820990723 is a deficient number, since it is larger than the sum of its proper divisors (1).

12820990723 is an equidigital number, since it uses as much as digits as its factorization.

12820990723 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 43.

The spelling of 12820990723 in words is "twelve billion, eight hundred twenty million, nine hundred ninety thousand, seven hundred twenty-three".