2780326563671 has 2 divisors, whose sum is σ = 2780326563672. Its totient is φ = 2780326563670.

The previous prime is 2780326563653. The next prime is 2780326563709. The reversal of 2780326563671 is 1763656230872.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2780326563671 - 2⁶ = 2780326563607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2780326563631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1390163281835 + 1390163281836.

It is an arithmetic number, because the mean of its divisors is an integer number (1390163281836).

Almost surely, 2^{2780326563671} is an apocalyptic number.

2780326563671 is a deficient number, since it is larger than the sum of its proper divisors (1).

2780326563671 is an equidigital number, since it uses as much as digits as its factorization.

2780326563671 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15240960, while the sum is 56.

The spelling of 2780326563671 in words is "two trillion, seven hundred eighty billion, three hundred twenty-six million, five hundred sixty-three thousand, six hundred seventy-one".