12820888649423 has 2 divisors, whose sum is σ = 12820888649424. Its totient is φ = 12820888649422.

The previous prime is 12820888649363. The next prime is 12820888649431. The reversal of 12820888649423 is 32494688802821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12820888649423 - 2⁸ = 12820888649167 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12820888649423.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12820888649453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6410444324711 + 6410444324712.

It is an arithmetic number, because the mean of its divisors is an integer number (6410444324712).

Almost surely, 2^{12820888649423} is an apocalyptic number.

12820888649423 is a deficient number, since it is larger than the sum of its proper divisors (1).

12820888649423 is an equidigital number, since it uses as much as digits as its factorization.

12820888649423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84934656, while the sum is 65.

The spelling of 12820888649423 in words is "twelve trillion, eight hundred twenty billion, eight hundred eighty-eight million, six hundred forty-nine thousand, four hundred twenty-three".