18195840008 has 32 divisors (see below), whose sum is σ = 35079917400. Its totient is φ = 8844346368.

The previous prime is 18195840007. The next prime is 18195840079. The reversal of 18195840008 is 80004859181.

It can be written as a sum of positive squares in 4 ways, for example, as 17716142404 + 479697604 = 133102^2 + 21902^2 .

It is not an unprimeable number, because it can be changed into a prime (18195840007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 150641 + ... + 243072.

Almost surely, 2^18195840008 is an apocalyptic number.

It is an amenable number.

18195840008 is a deficient number, since it is larger than the sum of its proper divisors (16884077392).

18195840008 is a wasteful number, since it uses less digits than its factorization.

18195840008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393881 (or 393877 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 44.

The spelling of 18195840008 in words is "eighteen billion, one hundred ninety-five million, eight hundred forty thousand, eight".