18878667687 has 36 divisors (see below), whose sum is σ = 30164756440. Its totient is φ = 11368637280.

The previous prime is 18878667673. The next prime is 18878667701. The reversal of 18878667687 is 78676687881.

It is an interprime number because it is at equal distance from previous prime (18878667673) and next prime (18878667701).

It is not a de Polignac number, because 18878667687 - 2¹⁰ = 18878666663 is a prime.

It is a super-3 number, since 3×18878667687³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18878667607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 115764 + ... + 226182.

Almost surely, 2^18878667687 is an apocalyptic number.

18878667687 is a deficient number, since it is larger than the sum of its proper divisors (11286088753).

18878667687 is a wasteful number, since it uses less digits than its factorization.

18878667687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110604 (or 110590 counting only the distinct ones).

The product of its digits is 303464448, while the sum is 72.

The spelling of 18878667687 in words is "eighteen billion, eight hundred seventy-eight million, six hundred sixty-seven thousand, six hundred eighty-seven".