18868639996 has 48 divisors (see below), whose sum is σ = 34971116544. Its totient is φ = 8889794496.

The previous prime is 18868639969. The next prime is 18868639997. The reversal of 18868639996 is 69993686881.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18868639997) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2799046 + ... + 2805778.

It is an arithmetic number, because the mean of its divisors is an integer number (728564928).

Almost surely, 2^18868639996 is an apocalyptic number.

It is an amenable number.

18868639996 is a deficient number, since it is larger than the sum of its proper divisors (16102476548).

18868639996 is a wasteful number, since it uses less digits than its factorization.

18868639996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7210 (or 7208 counting only the distinct ones).

The product of its digits is 241864704, while the sum is 73.

The spelling of 18868639996 in words is "eighteen billion, eight hundred sixty-eight million, six hundred thirty-nine thousand, nine hundred ninety-six".