17842978806785 has 16 divisors (see below), whose sum is σ = 23394521457792. Its totient is φ = 12956467353600.

The previous prime is 17842978806767. The next prime is 17842978806797. The reversal of 17842978806785 is 58760887924871.

It is a happy number.

It is not a de Polignac number, because 17842978806785 - 2¹⁶ = 17842978741249 is a prime.

It is a super-3 number, since 3×17842978806785³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 253020749 + ... + 253091258.

It is an arithmetic number, because the mean of its divisors is an integer number (1462157591112).

Almost surely, 2^{17842978806785} is an apocalyptic number.

It is an amenable number.

17842978806785 is a deficient number, since it is larger than the sum of its proper divisors (5551542651007).

17842978806785 is a wasteful number, since it uses less digits than its factorization.

17842978806785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506112664.

The product of its (nonzero) digits is 3034644480, while the sum is 80.

The spelling of 17842978806785 in words is "seventeen trillion, eight hundred forty-two billion, nine hundred seventy-eight million, eight hundred six thousand, seven hundred eighty-five".