18278949166275 has 24 divisors (see below), whose sum is σ = 34538509663744. Its totient is φ = 8356091047200.

The previous prime is 18278949166243. The next prime is 18278949166297. The reversal of 18278949166275 is 57266194987281.

It is not a de Polignac number, because 18278949166275 - 2⁵ = 18278949166243 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (75).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18278949166197 and 18278949166206.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17408522491 + ... + 17408523540.

Almost surely, 2^{18278949166275} is an apocalyptic number.

18278949166275 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18278949166275 is a deficient number, since it is larger than the sum of its proper divisors (16259560497469).

18278949166275 is a wasteful number, since it uses less digits than its factorization.

18278949166275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34817046051 (or 34817046046 counting only the distinct ones).

The product of its digits is 731566080, while the sum is 75.

The spelling of 18278949166275 in words is "eighteen trillion, two hundred seventy-eight billion, nine hundred forty-nine million, one hundred sixty-six thousand, two hundred seventy-five".