6781351667 has 2 divisors, whose sum is σ = 6781351668. Its totient is φ = 6781351666.

The previous prime is 6781351651. The next prime is 6781351723. The reversal of 6781351667 is 7661531876.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6781351667 - 2⁴ = 6781351651 is a prime.

It is not a weakly prime, because it can be changed into another prime (6781351637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3390675833 + 3390675834.

It is an arithmetic number, because the mean of its divisors is an integer number (3390675834).

Almost surely, 2^6781351667 is an apocalyptic number.

6781351667 is a deficient number, since it is larger than the sum of its proper divisors (1).

6781351667 is an equidigital number, since it uses as much as digits as its factorization.

6781351667 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1270080, while the sum is 50.

The square root of 6781351667 is about 82348.9627560663. The cubic root of 6781351667 is about 1892.8030286534.

The spelling of 6781351667 in words is "six billion, seven hundred eighty-one million, three hundred fifty-one thousand, six hundred sixty-seven".