18905869356 has 24 divisors (see below), whose sum is σ = 48124031424. Its totient is φ = 5729051280.

The previous prime is 18905869349. The next prime is 18905869361. The reversal of 18905869356 is 65396850981.

It is a super-2 number, since 2×18905869356² (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 18905869356.

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, 71613010 + ... + 71613273.

It is an arithmetic number, because the mean of its divisors is an integer number (2005167976).

Almost surely, 2^18905869356 is an apocalyptic number.

It is an amenable number.

18905869356 is an abundant number, since it is smaller than the sum of its proper divisors (29218162068).

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

18905869356 is a wasteful number, since it uses less digits than its factorization.

18905869356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143226301 (or 143226299 counting only the distinct ones).

The product of its (nonzero) digits is 13996800, while the sum is 60.

The spelling of 18905869356 in words is "eighteen billion, nine hundred five million, eight hundred sixty-nine thousand, three hundred fifty-six".