18664307547648 has 160 divisors (see below), whose sum is σ = 59817001347840. Its totient is φ = 5051992965120.

The previous prime is 18664307547631. The next prime is 18664307547701. The reversal of 18664307547648 is 84674570346681.

It is a Smith number, since the sum of its digits (69) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45477073 + ... + 45885648.

It is an arithmetic number, because the mean of its divisors is an integer number (373856258424).

Almost surely, 2^{18664307547648} is an apocalyptic number.

It is an amenable number.

18664307547648 is an abundant number, since it is smaller than the sum of its proper divisors (41152693800192).

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

18664307547648 is an equidigital number, since it uses as much as digits as its factorization.

18664307547648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91362768 (or 91362752 counting only the distinct ones).

The product of its (nonzero) digits is 650280960, while the sum is 69.

The spelling of 18664307547648 in words is "eighteen trillion, six hundred sixty-four billion, three hundred seven million, five hundred forty-seven thousand, six hundred forty-eight".