6639381743 has 2 divisors, whose sum is σ = 6639381744. Its totient is φ = 6639381742.

The previous prime is 6639381701. The next prime is 6639381757. The reversal of 6639381743 is 3471839366.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6639381743 - 2²² = 6635187439 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6639381691 and 6639381700.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6639384743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3319690871 + 3319690872.

It is an arithmetic number, because the mean of its divisors is an integer number (3319690872).

Almost surely, 2^6639381743 is an apocalyptic number.

6639381743 is a deficient number, since it is larger than the sum of its proper divisors (1).

6639381743 is an equidigital number, since it uses as much as digits as its factorization.

6639381743 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1959552, while the sum is 50.

The square root of 6639381743 is about 81482.4014312293. The cubic root of 6639381743 is about 1879.5009373025.

The spelling of 6639381743 in words is "six billion, six hundred thirty-nine million, three hundred eighty-one thousand, seven hundred forty-three".