18647223840 has 960 divisors, whose sum is σ = 81090180864. Its totient is φ = 3938844672.

The previous prime is 18647223799. The next prime is 18647223929. The reversal of 18647223840 is 4832274681.

It is a happy number.

18647223840 is a `hidden beast` number, since 1 + 86 + 472 + 23 + 84 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 165019624 + ... + 165019736.

Almost surely, 2^18647223840 is an apocalyptic number.

18647223840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18647223840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40545090432).

18647223840 is an abundant number, since it is smaller than the sum of its proper divisors (62442957024).

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

18647223840 is a wasteful number, since it uses less digits than its factorization.

18647223840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271 (or 254 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 45.

The spelling of 18647223840 in words is "eighteen billion, six hundred forty-seven million, two hundred twenty-three thousand, eight hundred forty".