6638772839 has 2 divisors, whose sum is σ = 6638772840. Its totient is φ = 6638772838.

The previous prime is 6638772827. The next prime is 6638772851. The reversal of 6638772839 is 9382778366.

It is a balanced prime because it is at equal distance from previous prime (6638772827) and next prime (6638772851).

It is a cyclic number.

It is not a de Polignac number, because 6638772839 - 2⁴ = 6638772823 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6638772809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3319386419 + 3319386420.

It is an arithmetic number, because the mean of its divisors is an integer number (3319386420).

Almost surely, 2^6638772839 is an apocalyptic number.

6638772839 is a deficient number, since it is larger than the sum of its proper divisors (1).

6638772839 is an equidigital number, since it uses as much as digits as its factorization.

6638772839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18289152, while the sum is 59.

The square root of 6638772839 is about 81478.6649313794. The cubic root of 6638772839 is about 1879.4434786078.

The spelling of 6638772839 in words is "six billion, six hundred thirty-eight million, seven hundred seventy-two thousand, eight hundred thirty-nine".