18131558008 has 16 divisors (see below), whose sum is σ = 35093338560. Its totient is φ = 8773334400.

The previous prime is 18131557999. The next prime is 18131558017. The reversal of 18131558008 is 80085513181.

It is an interprime number because it is at equal distance from previous prime (18131557999) and next prime (18131558017).

It is a congruent number.

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, 36555313 + ... + 36555808.

It is an arithmetic number, because the mean of its divisors is an integer number (2193333660).

Almost surely, 2^18131558008 is an apocalyptic number.

It is an amenable number.

18131558008 is a deficient number, since it is larger than the sum of its proper divisors (16961780552).

18131558008 is a wasteful number, since it uses less digits than its factorization.

18131558008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73111158 (or 73111154 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 40.

The spelling of 18131558008 in words is "eighteen billion, one hundred thirty-one million, five hundred fifty-eight thousand, eight".