18647819472 has 40 divisors (see below), whose sum is σ = 48452014944. Its totient is φ = 6180006784.

The previous prime is 18647819471. The next prime is 18647819501. The reversal of 18647819472 is 27491874681.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18647819471) 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, 1114518 + ... + 1131125.

Almost surely, 2^18647819472 is an apocalyptic number.

18647819472 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18647819472 is an abundant number, since it is smaller than the sum of its proper divisors (29804195472).

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

18647819472 is a wasteful number, since it uses less digits than its factorization.

18647819472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2245827 (or 2245821 counting only the distinct ones).

The product of its digits is 5419008, while the sum is 57.

The spelling of 18647819472 in words is "eighteen billion, six hundred forty-seven million, eight hundred nineteen thousand, four hundred seventy-two".