18408115413 has 6 divisors (see below), whose sum is σ = 26589500054. Its totient is φ = 12272076936.

The previous prime is 18408115403. The next prime is 18408115441. The reversal of 18408115413 is 31451180481.

It can be written as a sum of positive squares in only one way, i.e., 16881025329 + 1527090084 = 129927^2 + 39078^2 .

It is not a de Polignac number, because 18408115413 - 2⁸ = 18408115157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18408115403) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1022673070 + ... + 1022673087.

Almost surely, 2^18408115413 is an apocalyptic number.

It is an amenable number.

18408115413 is a deficient number, since it is larger than the sum of its proper divisors (8181384641).

18408115413 is a wasteful number, since it uses less digits than its factorization.

18408115413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2045346163 (or 2045346160 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 36.

Adding to 18408115413 its reverse (31451180481), we get a palindrome (49859295894).

The spelling of 18408115413 in words is "eighteen billion, four hundred eight million, one hundred fifteen thousand, four hundred thirteen".