394173661816 has 16 divisors (see below), whose sum is σ = 806264308440. Its totient is φ = 179169846240.

The previous prime is 394173661799. The next prime is 394173661837. The reversal of 394173661816 is 618166371493.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2239622991 + ... + 2239623166.

Almost surely, 2^394173661816 is an apocalyptic number.

It is an amenable number.

394173661816 is an abundant number, since it is smaller than the sum of its proper divisors (412090646624).

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

394173661816 is a wasteful number, since it uses less digits than its factorization.

394173661816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4479246174 (or 4479246170 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 55.

The spelling of 394173661816 in words is "three hundred ninety-four billion, one hundred seventy-three million, six hundred sixty-one thousand, eight hundred sixteen".