12820888649431 has 2 divisors, whose sum is σ = 12820888649432. Its totient is φ = 12820888649430.

The previous prime is 12820888649423. The next prime is 12820888649447. The reversal of 12820888649431 is 13494688802821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12820888649431 - 2³ = 12820888649423 is a prime.

It is a super-2 number, since 2×12820888649431² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12820888649731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6410444324715 + 6410444324716.

It is an arithmetic number, because the mean of its divisors is an integer number (6410444324716).

Almost surely, 2^{12820888649431} is an apocalyptic number.

12820888649431 is a deficient number, since it is larger than the sum of its proper divisors (1).

12820888649431 is an equidigital number, since it uses as much as digits as its factorization.

12820888649431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42467328, while the sum is 64.

The spelling of 12820888649431 in words is "twelve trillion, eight hundred twenty billion, eight hundred eighty-eight million, six hundred forty-nine thousand, four hundred thirty-one".