7643216659 has 16 divisors (see below), whose sum is σ = 8690644480. Its totient is φ = 6663682080.

The previous prime is 7643216653. The next prime is 7643216681. The reversal of 7643216659 is 9566123467.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 7643216659 - 2⁵ = 7643216627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7643216653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35014 + ... + 128500.

It is an arithmetic number, because the mean of its divisors is an integer number (543165280).

Almost surely, 2^7643216659 is an apocalyptic number.

7643216659 is a deficient number, since it is larger than the sum of its proper divisors (1047427821).

7643216659 is a wasteful number, since it uses less digits than its factorization.

7643216659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93850.

The product of its digits is 1632960, while the sum is 49.

The square root of 7643216659 is about 87425.4920432250. The cubic root of 7643216659 is about 1969.8147728825.

The spelling of 7643216659 in words is "seven billion, six hundred forty-three million, two hundred sixteen thousand, six hundred fifty-nine".