1685128478218 has 16 divisors (see below), whose sum is σ = 2545958852640. Its totient is φ = 836475914736.

The previous prime is 1685128478161. The next prime is 1685128478273. The reversal of 1685128478218 is 8128748215861.

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, 10846321 + ... + 11000587.

It is an arithmetic number, because the mean of its divisors is an integer number (159122428290).

Almost surely, 2^{1685128478218} is an apocalyptic number.

1685128478218 is a deficient number, since it is larger than the sum of its proper divisors (860830374422).

1685128478218 is a wasteful number, since it uses less digits than its factorization.

1685128478218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193701.

The product of its digits is 13762560, while the sum is 61.

The spelling of 1685128478218 in words is "one trillion, six hundred eighty-five billion, one hundred twenty-eight million, four hundred seventy-eight thousand, two hundred eighteen".