18421809570 has 48 divisors (see below), whose sum is σ = 47904250680. Its totient is φ = 4911708672.

The previous prime is 18421809563. The next prime is 18421809587. The reversal of 18421809570 is 7590812481.

It can be written as a sum of positive squares in 4 ways, for example, as 12510198801 + 5911610769 = 111849^2 + 76887^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 770232 + ... + 793788.

Almost surely, 2^18421809570 is an apocalyptic number.

18421809570 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18421809570 is an abundant number, since it is smaller than the sum of its proper divisors (29482441110).

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

18421809570 is a wasteful number, since it uses less digits than its factorization.

18421809570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32259 (or 32256 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 45.

The spelling of 18421809570 in words is "eighteen billion, four hundred twenty-one million, eight hundred nine thousand, five hundred seventy".