18872787409 has 16 divisors (see below), whose sum is σ = 21787315200. Its totient is φ = 16013634624.

The previous prime is 18872787403. The next prime is 18872787413. The reversal of 18872787409 is 90478727881.

It is a cyclic number.

It is not a de Polignac number, because 18872787409 - 2¹³ = 18872779217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18872787403) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 263712 + ... + 327550.

It is an arithmetic number, because the mean of its divisors is an integer number (1361707200).

Almost surely, 2^18872787409 is an apocalyptic number.

It is an amenable number.

18872787409 is a deficient number, since it is larger than the sum of its proper divisors (2914527791).

18872787409 is a wasteful number, since it uses less digits than its factorization.

18872787409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64272.

The product of its (nonzero) digits is 12644352, while the sum is 61.

The spelling of 18872787409 in words is "eighteen billion, eight hundred seventy-two million, seven hundred eighty-seven thousand, four hundred nine".