8631818945 has 4 divisors (see below), whose sum is σ = 10358182740. Its totient is φ = 6905455152.

The previous prime is 8631818917. The next prime is 8631818947. The reversal of 8631818945 is 5498181368.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2185656001 + 6446162944 = 46751^2 + 80288^2 .

It is a cyclic number.

It is not a de Polignac number, because 8631818945 - 2²⁶ = 8564710081 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8631818947) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 863181890 + ... + 863181899.

It is an arithmetic number, because the mean of its divisors is an integer number (2589545685).

Almost surely, 2^8631818945 is an apocalyptic number.

It is an amenable number.

8631818945 is a deficient number, since it is larger than the sum of its proper divisors (1726363795).

8631818945 is a wasteful number, since it uses less digits than its factorization.

8631818945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1726363794.

The product of its digits is 1658880, while the sum is 53.

The square root of 8631818945 is about 92907.5828175505. The cubic root of 8631818945 is about 2051.3232737422.

The spelling of 8631818945 in words is "eight billion, six hundred thirty-one million, eight hundred eighteen thousand, nine hundred forty-five".