18663976672 has 96 divisors (see below), whose sum is σ = 40781349504. Its totient is φ = 8336908800.

The previous prime is 18663976627. The next prime is 18663976673. The reversal of 18663976672 is 27667936681.

It is a super-3 number, since 3×18663976672³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18663976672.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18663976673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14456347 + ... + 14457637.

It is an arithmetic number, because the mean of its divisors is an integer number (424805724).

Almost surely, 2^18663976672 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18663976672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20390674752).

18663976672 is an abundant number, since it is smaller than the sum of its proper divisors (22117372832).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18663976672 is a wasteful number, since it uses less digits than its factorization.

18663976672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1992 (or 1984 counting only the distinct ones).

The product of its digits is 27433728, while the sum is 61.

The spelling of 18663976672 in words is "eighteen billion, six hundred sixty-three million, nine hundred seventy-six thousand, six hundred seventy-two".