13408516818 has 32 divisors (see below), whose sum is σ = 29801545920. Its totient is φ = 4468779360.

The previous prime is 13408516739. The next prime is 13408516841. The reversal of 13408516818 is 81861580431.

13408516818 is a `hidden beast` number, since 13 + 40 + 8 + 516 + 81 + 8 = 666.

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, 392773 + ... + 425543.

It is an arithmetic number, because the mean of its divisors is an integer number (931298310).

Almost surely, 2^13408516818 is an apocalyptic number.

13408516818 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

13408516818 is an abundant number, since it is smaller than the sum of its proper divisors (16393029102).

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

13408516818 is a wasteful number, since it uses less digits than its factorization.

13408516818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40359 (or 40353 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 45.

It can be divided in two parts, 1340 and 8516818, that added together give a palindrome (8518158).

The spelling of 13408516818 in words is "thirteen billion, four hundred eight million, five hundred sixteen thousand, eight hundred eighteen".