17985346878 has 16 divisors (see below), whose sum is σ = 36306869760. Its totient is φ = 5939086296.

The previous prime is 17985346837. The next prime is 17985346879. The reversal of 17985346878 is 87864358971.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17985346879) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14006638 + ... + 14007921.

It is an arithmetic number, because the mean of its divisors is an integer number (2269179360).

Almost surely, 2^17985346878 is an apocalyptic number.

17985346878 is an abundant number, since it is smaller than the sum of its proper divisors (18321522882).

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

17985346878 is a wasteful number, since it uses less digits than its factorization.

17985346878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28014671.

The product of its digits is 81285120, while the sum is 66.

The spelling of 17985346878 in words is "seventeen billion, nine hundred eighty-five million, three hundred forty-six thousand, eight hundred seventy-eight".