8365665638 has 16 divisors (see below), whose sum is σ = 13692815424. Its totient is φ = 3801590760.

The previous prime is 8365665631. The next prime is 8365665683.

8365665638 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8365665631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41381 + ... + 135807.

It is an arithmetic number, because the mean of its divisors is an integer number (855800964).

Almost surely, 2^8365665638 is an apocalyptic number.

8365665638 is a deficient number, since it is larger than the sum of its proper divisors (5327149786).

8365665638 is a wasteful number, since it uses less digits than its factorization.

8365665638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98467.

The product of its digits is 18662400, while the sum is 56.

The square root of 8365665638 is about 91464.0128028505. The cubic root of 8365665638 is about 2030.0193028813.

The spelling of 8365665638 in words is "eight billion, three hundred sixty-five million, six hundred sixty-five thousand, six hundred thirty-eight".