9664444637 has 2 divisors, whose sum is σ = 9664444638. Its totient is φ = 9664444636.

The previous prime is 9664444633. The next prime is 9664444663. The reversal of 9664444637 is 7364444669.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9614586916 + 49857721 = 98054^2 + 7061^2 .

It is a cyclic number.

It is not a de Polignac number, because 9664444637 - 2² = 9664444633 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9664444633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4832222318 + 4832222319.

It is an arithmetic number, because the mean of its divisors is an integer number (4832222319).

Almost surely, 2^9664444637 is an apocalyptic number.

It is an amenable number.

9664444637 is a deficient number, since it is larger than the sum of its proper divisors (1).

9664444637 is an equidigital number, since it uses as much as digits as its factorization.

9664444637 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10450944, while the sum is 53.

The square root of 9664444637 is about 98307.9072964123. The cubic root of 9664444637 is about 2130.0622754317.

The spelling of 9664444637 in words is "nine billion, six hundred sixty-four million, four hundred forty-four thousand, six hundred thirty-seven".