6766478913791 has 2 divisors, whose sum is σ = 6766478913792. Its totient is φ = 6766478913790.

The previous prime is 6766478913773. The next prime is 6766478913841. The reversal of 6766478913791 is 1973198746676.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6766478913791 - 2²⁶ = 6766411804927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6766474913791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3383239456895 + 3383239456896.

It is an arithmetic number, because the mean of its divisors is an integer number (3383239456896).

Almost surely, 2^{6766478913791} is an apocalyptic number.

6766478913791 is a deficient number, since it is larger than the sum of its proper divisors (1).

6766478913791 is an equidigital number, since it uses as much as digits as its factorization.

6766478913791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 576108288, while the sum is 74.

The spelling of 6766478913791 in words is "six trillion, seven hundred sixty-six billion, four hundred seventy-eight million, nine hundred thirteen thousand, seven hundred ninety-one".