18825961818 has 16 divisors (see below), whose sum is σ = 37658746656. Its totient is φ = 6274183440.

The previous prime is 18825961801. The next prime is 18825961837. The reversal of 18825961818 is 81816952881.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 248068 + ... + 314943.

It is an arithmetic number, because the mean of its divisors is an integer number (2353671666).

Almost surely, 2^18825961818 is an apocalyptic number.

18825961818 is an abundant number, since it is smaller than the sum of its proper divisors (18832784838).

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

18825961818 is a wasteful number, since it uses less digits than its factorization.

18825961818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 568589.

The product of its digits is 2211840, while the sum is 57.

The spelling of 18825961818 in words is "eighteen billion, eight hundred twenty-five million, nine hundred sixty-one thousand, eight hundred eighteen".