6538644767 has 2 divisors, whose sum is σ = 6538644768. Its totient is φ = 6538644766.

The previous prime is 6538644751. The next prime is 6538644787. The reversal of 6538644767 is 7674468356.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6538644767 - 2⁴ = 6538644751 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6538644727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3269322383 + 3269322384.

It is an arithmetic number, because the mean of its divisors is an integer number (3269322384).

Almost surely, 2^6538644767 is an apocalyptic number.

6538644767 is a deficient number, since it is larger than the sum of its proper divisors (1).

6538644767 is an equidigital number, since it uses as much as digits as its factorization.

6538644767 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20321280, while the sum is 56.

The square root of 6538644767 is about 80861.8869863918. The cubic root of 6538644767 is about 1869.9467863073.

The spelling of 6538644767 in words is "six billion, five hundred thirty-eight million, six hundred forty-four thousand, seven hundred sixty-seven".