18170872878 has 16 divisors (see below), whose sum is σ = 36350173440. Its totient is φ = 6055553016.

The previous prime is 18170872849. The next prime is 18170872961. The reversal of 18170872878 is 87827807181.

It is a happy number.

It is a super-2 number, since 2×18170872878² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 322950 + ... + 375017.

It is an arithmetic number, because the mean of its divisors is an integer number (2271885840).

Almost surely, 2^18170872878 is an apocalyptic number.

18170872878 is an abundant number, since it is smaller than the sum of its proper divisors (18179300562).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18170872878 is a wasteful number, since it uses less digits than its factorization.

18170872878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 702311.

The product of its (nonzero) digits is 2809856, while the sum is 57.

The spelling of 18170872878 in words is "eighteen billion, one hundred seventy million, eight hundred seventy-two thousand, eight hundred seventy-eight".