16861354878 has 128 divisors (see below), whose sum is σ = 37286645760. Its totient is φ = 5066772480.

The previous prime is 16861354859. The next prime is 16861354891. The reversal of 16861354878 is 87845316861.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 50033526 + ... + 50033862.

It is an arithmetic number, because the mean of its divisors is an integer number (291301920).

Almost surely, 2^16861354878 is an apocalyptic number.

16861354878 is an abundant number, since it is smaller than the sum of its proper divisors (20425290882).

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

16861354878 is a wasteful number, since it uses less digits than its factorization.

16861354878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 682.

The product of its digits is 7741440, while the sum is 57.

The spelling of 16861354878 in words is "sixteen billion, eight hundred sixty-one million, three hundred fifty-four thousand, eight hundred seventy-eight".