9138618566 has 64 divisors (see below), whose sum is σ = 18882616320. Its totient is φ = 3205340160.

The previous prime is 9138618563. The next prime is 9138618569. The reversal of 9138618566 is 6658168319.

It is an interprime number because it is at equal distance from previous prime (9138618563) and next prime (9138618569).

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9138618563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15671 + ... + 136098.

It is an arithmetic number, because the mean of its divisors is an integer number (295040880).

Almost surely, 2^9138618566 is an apocalyptic number.

9138618566 is an abundant number, since it is smaller than the sum of its proper divisors (9743997754).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9138618566 is a wasteful number, since it uses less digits than its factorization.

9138618566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151829.

The product of its digits is 1866240, while the sum is 53.

The square root of 9138618566 is about 95596.1221284629. The cubic root of 9138618566 is about 2090.7086541752.

The spelling of 9138618566 in words is "nine billion, one hundred thirty-eight million, six hundred eighteen thousand, five hundred sixty-six".