18873539108 has 12 divisors (see below), whose sum is σ = 33033529200. Its totient is φ = 9435387912.

The previous prime is 18873539089. The next prime is 18873539117. The reversal of 18873539108 is 80193537881.

It is a happy number.

It is a super-2 number, since 2×18873539108² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18873539108.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 314366 + ... + 369557.

It is an arithmetic number, because the mean of its divisors is an integer number (2752794100).

Almost surely, 2^18873539108 is an apocalyptic number.

It is an amenable number.

18873539108 is a deficient number, since it is larger than the sum of its proper divisors (14159990092).

18873539108 is a wasteful number, since it uses less digits than its factorization.

18873539108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690826 (or 690824 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 53.

Adding to 18873539108 its sum of digits (53), we get a square (18873539161 = 137381²).

The spelling of 18873539108 in words is "eighteen billion, eight hundred seventy-three million, five hundred thirty-nine thousand, one hundred eight".