18446732640 has 768 divisors, whose sum is σ = 79270410240. Its totient is φ = 3959414784.

The previous prime is 18446732567. The next prime is 18446732671. The reversal of 18446732640 is 4623764481.

18446732640 is a `hidden beast` number, since 184 + 467 + 3 + 2 + 6 + 4 + 0 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 41640259 + ... + 41640701.

It is an arithmetic number, because the mean of its divisors is an integer number (103216680).

Almost surely, 2^18446732640 is an apocalyptic number.

18446732640 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 18446732640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39635205120).

18446732640 is an abundant number, since it is smaller than the sum of its proper divisors (60823677600).

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

18446732640 is an equidigital number, since it uses as much as digits as its factorization.

18446732640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503 (or 477 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 45.

The spelling of 18446732640 in words is "eighteen billion, four hundred forty-six million, seven hundred thirty-two thousand, six hundred forty".