18838851870 has 16 divisors (see below), whose sum is σ = 45213244560. Its totient is φ = 5023693824.

The previous prime is 18838851851. The next prime is 18838851901. The reversal of 18838851870 is 7815883881.

It is a self number, because there is not a number n which added to its sum of digits gives 18838851870.

It is a congruent number.

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, 313980835 + ... + 313980894.

It is an arithmetic number, because the mean of its divisors is an integer number (2825827785).

Almost surely, 2^18838851870 is an apocalyptic number.

18838851870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18838851870 is an abundant number, since it is smaller than the sum of its proper divisors (26374392690).

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

18838851870 is a wasteful number, since it uses less digits than its factorization.

18838851870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 627961739.

The product of its (nonzero) digits is 3440640, while the sum is 57.

The spelling of 18838851870 in words is "eighteen billion, eight hundred thirty-eight million, eight hundred fifty-one thousand, eight hundred seventy".