18872458209 has 36 divisors (see below), whose sum is σ = 30996993300. Its totient is φ = 11043426240.

The previous prime is 18872458159. The next prime is 18872458261. The reversal of 18872458209 is 90285427881.

18872458209 is a `hidden beast` number, since 188 + 7 + 2 + 458 + 2 + 0 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 3221697600 + 15650760609 = 56760^2 + 125103^2 .

It is not a de Polignac number, because 18872458209 - 2¹⁷ = 18872327137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18872458279) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 267214 + ... + 330375.

Almost surely, 2^18872458209 is an apocalyptic number.

It is an amenable number.

18872458209 is a deficient number, since it is larger than the sum of its proper divisors (12124535091).

18872458209 is a wasteful number, since it uses less digits than its factorization.

18872458209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 597646 (or 597632 counting only the distinct ones).

The product of its (nonzero) digits is 2580480, while the sum is 54.

The spelling of 18872458209 in words is "eighteen billion, eight hundred seventy-two million, four hundred fifty-eight thousand, two hundred nine".