6881312731663 has 2 divisors, whose sum is σ = 6881312731664. Its totient is φ = 6881312731662.

The previous prime is 6881312731627. The next prime is 6881312731673. The reversal of 6881312731663 is 3661372131886.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6881312731663 - 2¹³ = 6881312723471 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6881312731673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3440656365831 + 3440656365832.

It is an arithmetic number, because the mean of its divisors is an integer number (3440656365832).

Almost surely, 2^{6881312731663} is an apocalyptic number.

6881312731663 is a deficient number, since it is larger than the sum of its proper divisors (1).

6881312731663 is an equidigital number, since it uses as much as digits as its factorization.

6881312731663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5225472, while the sum is 55.

The spelling of 6881312731663 in words is "six trillion, eight hundred eighty-one billion, three hundred twelve million, seven hundred thirty-one thousand, six hundred sixty-three".