6738639641 has 2 divisors, whose sum is σ = 6738639642. Its totient is φ = 6738639640.

The previous prime is 6738639631. The next prime is 6738639643. The reversal of 6738639641 is 1469368376.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3524203225 + 3214436416 = 59365^2 + 56696^2 .

It is a cyclic number.

It is not a de Polignac number, because 6738639641 - 2⁶ = 6738639577 is a prime.

It is a super-2 number, since 2×6738639641² = 90818528422513217762, which contains 22 as substring.

Together with 6738639643, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6738639643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3369319820 + 3369319821.

It is an arithmetic number, because the mean of its divisors is an integer number (3369319821).

Almost surely, 2^6738639641 is an apocalyptic number.

It is an amenable number.

6738639641 is a deficient number, since it is larger than the sum of its proper divisors (1).

6738639641 is an equidigital number, since it uses as much as digits as its factorization.

6738639641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3919104, while the sum is 53.

The square root of 6738639641 is about 82089.2175684481. The cubic root of 6738639641 is about 1888.8207457525.

The spelling of 6738639641 in words is "six billion, seven hundred thirty-eight million, six hundred thirty-nine thousand, six hundred forty-one".