6639381701 has 2 divisors, whose sum is σ = 6639381702. Its totient is φ = 6639381700.

The previous prime is 6639381691. The next prime is 6639381743. The reversal of 6639381701 is 1071839366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6593277601 + 46104100 = 81199^2 + 6790^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6639381701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6639381101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3319690850 + 3319690851.

It is an arithmetic number, because the mean of its divisors is an integer number (3319690851).

Almost surely, 2^6639381701 is an apocalyptic number.

It is an amenable number.

6639381701 is a deficient number, since it is larger than the sum of its proper divisors (1).

6639381701 is an equidigital number, since it uses as much as digits as its factorization.

6639381701 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 6639381701 is about 81482.4011735049. The cubic root of 6639381701 is about 1879.5009333393.

The spelling of 6639381701 in words is "six billion, six hundred thirty-nine million, three hundred eighty-one thousand, seven hundred one".