6638816212747 has 2 divisors, whose sum is σ = 6638816212748. Its totient is φ = 6638816212746.

The previous prime is 6638816212667. The next prime is 6638816212753. The reversal of 6638816212747 is 7472126188366.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6638816212747 - 2¹¹ = 6638816210699 is a prime.

It is not a weakly prime, because it can be changed into another prime (6638816215747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3319408106373 + 3319408106374.

It is an arithmetic number, because the mean of its divisors is an integer number (3319408106374).

Almost surely, 2^{6638816212747} is an apocalyptic number.

6638816212747 is a deficient number, since it is larger than the sum of its proper divisors (1).

6638816212747 is an equidigital number, since it uses as much as digits as its factorization.

6638816212747 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32514048, while the sum is 61.

The spelling of 6638816212747 in words is "six trillion, six hundred thirty-eight billion, eight hundred sixteen million, two hundred twelve thousand, seven hundred forty-seven".