18646606944 has 384 divisors, whose sum is σ = 66653798400. Its totient is φ = 5011974144.

The previous prime is 18646606939. The next prime is 18646606949. The reversal of 18646606944 is 44960664681.

It is a happy number.

18646606944 is a `hidden beast` number, since 1 + 86 + 466 + 0 + 69 + 44 = 666.

It is an interprime number because it is at equal distance from previous prime (18646606939) and next prime (18646606949).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18646606949) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8326977 + ... + 8329215.

It is an arithmetic number, because the mean of its divisors is an integer number (173577600).

Almost surely, 2^18646606944 is an apocalyptic number.

18646606944 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 18646606944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33326899200).

18646606944 is an abundant number, since it is smaller than the sum of its proper divisors (48007191456).

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

18646606944 is an equidigital number, since it uses as much as digits as its factorization.

18646606944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2294 (or 2268 counting only the distinct ones).

The product of its (nonzero) digits is 5971968, while the sum is 54.

The spelling of 18646606944 in words is "eighteen billion, six hundred forty-six million, six hundred six thousand, nine hundred forty-four".