18446320512 has 192 divisors, whose sum is σ = 55751404800. Its totient is φ = 6070132224.

The previous prime is 18446320481. The next prime is 18446320523. The reversal of 18446320512 is 21502364481.

It is a happy number.

18446320512 is a `hidden beast` number, since 1 + 8 + 4 + 4 + 632 + 0 + 5 + 12 = 666.

It is a tau number, because it is divible by the number of its divisors (192).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2453463 + ... + 2460969.

It is an arithmetic number, because the mean of its divisors is an integer number (290371900).

Almost surely, 2^18446320512 is an apocalyptic number.

18446320512 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 18446320512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27875702400).

18446320512 is an abundant number, since it is smaller than the sum of its proper divisors (37305084288).

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

18446320512 is an frugal number, since it uses more digits than its factorization.

18446320512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7615 (or 7591 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

Adding to 18446320512 its reverse (21502364481), we get a palindrome (39948684993).

The spelling of 18446320512 in words is "eighteen billion, four hundred forty-six million, three hundred twenty thousand, five hundred twelve".