18403622056405 has 32 divisors (see below), whose sum is σ = 22434621580800. Its totient is φ = 14489793196032.

The previous prime is 18403622056403. The next prime is 18403622056409. The reversal of 18403622056405 is 50465022630481.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 18403622056405 - 2¹ = 18403622056403 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18403622056403) 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, 2161821429 + ... + 2161829941.

It is an arithmetic number, because the mean of its divisors is an integer number (701081924400).

Almost surely, 2^{18403622056405} is an apocalyptic number.

It is an amenable number.

18403622056405 is a deficient number, since it is larger than the sum of its proper divisors (4030999524395).

18403622056405 is a wasteful number, since it uses less digits than its factorization.

18403622056405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13773.

The product of its (nonzero) digits is 1382400, while the sum is 46.

Adding to 18403622056405 its reverse (50465022630481), we get a palindrome (68868644686886).

The spelling of 18403622056405 in words is "eighteen trillion, four hundred three billion, six hundred twenty-two million, fifty-six thousand, four hundred five".