18063632008 has 16 divisors (see below), whose sum is σ = 33956383500. Its totient is φ = 9008596416.

The previous prime is 18063631933. The next prime is 18063632011. The reversal of 18063632008 is 80023636081.

It can be written as a sum of positive squares in 2 ways, for example, as 13590430084 + 4473201924 = 116578^2 + 66882^2 .

It is a super-2 number, since 2×18063632008² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2899143 + ... + 2905366.

Almost surely, 2^18063632008 is an apocalyptic number.

It is an amenable number.

18063632008 is a deficient number, since it is larger than the sum of its proper divisors (15892751492).

18063632008 is a wasteful number, since it uses less digits than its factorization.

18063632008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5804904 (or 5804900 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 37.

The spelling of 18063632008 in words is "eighteen billion, sixty-three million, six hundred thirty-two thousand, eight".