2781256630667 has 2 divisors, whose sum is σ = 2781256630668. Its totient is φ = 2781256630666.

The previous prime is 2781256630609. The next prime is 2781256630693. The reversal of 2781256630667 is 7660366521872.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2781256630667 - 2¹⁸ = 2781256368523 is a prime.

It is not a weakly prime, because it can be changed into another prime (2781256630267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1390628315333 + 1390628315334.

It is an arithmetic number, because the mean of its divisors is an integer number (1390628315334).

Almost surely, 2^{2781256630667} is an apocalyptic number.

2781256630667 is a deficient number, since it is larger than the sum of its proper divisors (1).

2781256630667 is an equidigital number, since it uses as much as digits as its factorization.

2781256630667 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30481920, while the sum is 59.

The spelling of 2781256630667 in words is "two trillion, seven hundred eighty-one billion, two hundred fifty-six million, six hundred thirty thousand, six hundred sixty-seven".