18520004017405 has 16 divisors (see below), whose sum is σ = 24246388946304. Its totient is φ = 13467971580480.

The previous prime is 18520004017381. The next prime is 18520004017433. The reversal of 18520004017405 is 50471040002581.

It is not a de Polignac number, because 18520004017405 - 2⁹ = 18520004016893 is a prime.

It is a Duffinian number.

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, 13361742 + ... + 14682511.

It is an arithmetic number, because the mean of its divisors is an integer number (1515399309144).

Almost surely, 2^{18520004017405} is an apocalyptic number.

It is an amenable number.

18520004017405 is a deficient number, since it is larger than the sum of its proper divisors (5726384928899).

18520004017405 is a wasteful number, since it uses less digits than its factorization.

18520004017405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28056276.

The product of its (nonzero) digits is 44800, while the sum is 37.

Adding to 18520004017405 its reverse (50471040002581), we get a palindrome (68991044019986).

The spelling of 18520004017405 in words is "eighteen trillion, five hundred twenty billion, four million, seventeen thousand, four hundred five".