18393661440005 has 32 divisors (see below), whose sum is σ = 23777114713344. Its totient is φ = 13623782363136.

The previous prime is 18393661440001. The next prime is 18393661440013. The reversal of 18393661440005 is 50004416639381.

It is a cyclic number.

It is not a de Polignac number, because 18393661440005 - 2² = 18393661440001 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18393661440001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10377839 + ... + 12020268.

It is an arithmetic number, because the mean of its divisors is an integer number (743034834792).

Almost surely, 2^{18393661440005} is an apocalyptic number.

It is an amenable number.

18393661440005 is a deficient number, since it is larger than the sum of its proper divisors (5383453273339).

18393661440005 is a wasteful number, since it uses less digits than its factorization.

18393661440005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22398365.

The product of its (nonzero) digits is 1866240, while the sum is 50.

The spelling of 18393661440005 in words is "eighteen trillion, three hundred ninety-three billion, six hundred sixty-one million, four hundred forty thousand, five".