18646247412 has 192 divisors, whose sum is σ = 54045573120. Its totient is φ = 5520700800.

The previous prime is 18646247371. The next prime is 18646247447. The reversal of 18646247412 is 21474264681.

18646247412 is a `hidden beast` number, since 1 + 8 + 6 + 4 + 624 + 7 + 4 + 12 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8311963 + ... + 8314205.

It is an arithmetic number, because the mean of its divisors is an integer number (281487360).

Almost surely, 2^18646247412 is an apocalyptic number.

18646247412 is a gapful number since it is divisible by the number (12) 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 18646247412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27022786560).

18646247412 is an abundant number, since it is smaller than the sum of its proper divisors (35399325708).

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

18646247412 is a wasteful number, since it uses less digits than its factorization.

18646247412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2491 (or 2483 counting only the distinct ones).

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

The spelling of 18646247412 in words is "eighteen billion, six hundred forty-six million, two hundred forty-seven thousand, four hundred twelve".