18847793664 has 640 divisors, whose sum is σ = 67546152960. Its totient is φ = 5076172800.

The previous prime is 18847793663. The next prime is 18847793677. The reversal of 18847793664 is 46639774881.

18847793664 is a `hidden beast` number, since 18 + 8 + 477 + 93 + 6 + 64 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18847793663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 182988237 + ... + 182988339.

It is an arithmetic number, because the mean of its divisors is an integer number (105540864).

Almost surely, 2^18847793664 is an apocalyptic number.

18847793664 is a gapful number since it is divisible by the number (14) 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 18847793664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33773076480).

18847793664 is an abundant number, since it is smaller than the sum of its proper divisors (48698359296).

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

18847793664 is a wasteful number, since it uses less digits than its factorization.

18847793664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229 (or 207 counting only the distinct ones).

The product of its digits is 48771072, while the sum is 63.

The spelling of 18847793664 in words is "eighteen billion, eight hundred forty-seven million, seven hundred ninety-three thousand, six hundred sixty-four".