18678155871 has 8 divisors (see below), whose sum is σ = 24905647360. Its totient is φ = 12451384152.

The previous prime is 18678155863. The next prime is 18678155879. The reversal of 18678155871 is 17855187681.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18678155863) and next prime (18678155879).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18678155871 - 2³ = 18678155863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18678155879) 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 7 ways as a sum of consecutive naturals, for example, 116161 + ... + 225498.

It is an arithmetic number, because the mean of its divisors is an integer number (3113205920).

Almost surely, 2^18678155871 is an apocalyptic number.

18678155871 is a deficient number, since it is larger than the sum of its proper divisors (6227491489).

18678155871 is a wasteful number, since it uses less digits than its factorization.

18678155871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359885.

The product of its digits is 3763200, while the sum is 57.

The spelling of 18678155871 in words is "eighteen billion, six hundred seventy-eight million, one hundred fifty-five thousand, eight hundred seventy-one".