6440767633 has 2 divisors, whose sum is σ = 6440767634. Its totient is φ = 6440767632.

The previous prime is 6440767631. The next prime is 6440767639. The reversal of 6440767633 is 3367670446.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4031234064 + 2409533569 = 63492^2 + 49087^2 .

It is a cyclic number.

It is not a de Polignac number, because 6440767633 - 2¹ = 6440767631 is a prime.

Together with 6440767631, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (6440767631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3220383816 + 3220383817.

It is an arithmetic number, because the mean of its divisors is an integer number (3220383817).

Almost surely, 2^6440767633 is an apocalyptic number.

It is an amenable number.

6440767633 is a deficient number, since it is larger than the sum of its proper divisors (1).

6440767633 is an equidigital number, since it uses as much as digits as its factorization.

6440767633 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1524096, while the sum is 46.

The square root of 6440767633 is about 80254.3932317727. The cubic root of 6440767633 is about 1860.5694129963.

The spelling of 6440767633 in words is "six billion, four hundred forty million, seven hundred sixty-seven thousand, six hundred thirty-three".