6637664443 has 2 divisors, whose sum is σ = 6637664444. Its totient is φ = 6637664442.

The previous prime is 6637664389. The next prime is 6637664447. The reversal of 6637664443 is 3444667366.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6637664443 - 2²¹ = 6635567291 is a prime.

It is not a weakly prime, because it can be changed into another prime (6637664447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3318832221 + 3318832222.

It is an arithmetic number, because the mean of its divisors is an integer number (3318832222).

Almost surely, 2^6637664443 is an apocalyptic number.

6637664443 is a deficient number, since it is larger than the sum of its proper divisors (1).

6637664443 is an equidigital number, since it uses as much as digits as its factorization.

6637664443 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5225472, while the sum is 49.

The square root of 6637664443 is about 81471.8628914302. The cubic root of 6637664443 is about 1879.3388767670.

The spelling of 6637664443 in words is "six billion, six hundred thirty-seven million, six hundred sixty-four thousand, four hundred forty-three".