1963777278647 has 2 divisors, whose sum is σ = 1963777278648. Its totient is φ = 1963777278646.

The previous prime is 1963777278629. The next prime is 1963777278667. The reversal of 1963777278647 is 7468727773691.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1963777278647 - 2¹² = 1963777274551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1963777278667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 981888639323 + 981888639324.

It is an arithmetic number, because the mean of its divisors is an integer number (981888639324).

Almost surely, 2^{1963777278647} is an apocalyptic number.

1963777278647 is a deficient number, since it is larger than the sum of its proper divisors (1).

1963777278647 is an equidigital number, since it uses as much as digits as its factorization.

1963777278647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1045529856, while the sum is 74.

The spelling of 1963777278647 in words is "one trillion, nine hundred sixty-three billion, seven hundred seventy-seven million, two hundred seventy-eight thousand, six hundred forty-seven".