842778874217 has 16 divisors (see below), whose sum is σ = 975388003200. Its totient is φ = 713245948800.

The previous prime is 842778874213. The next prime is 842778874261. The reversal of 842778874217 is 712478877248.

It is not a de Polignac number, because 842778874217 - 2² = 842778874213 is a prime.

It is a super-3 number, since 3×842778874217³ (a number of 37 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (842778874211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 528167 + ... + 1401612.

It is an arithmetic number, because the mean of its divisors is an integer number (60961750200).

Almost surely, 2^842778874217 is an apocalyptic number.

It is an amenable number.

842778874217 is a deficient number, since it is larger than the sum of its proper divisors (132609128983).

842778874217 is a wasteful number, since it uses less digits than its factorization.

842778874217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1930576.

The product of its digits is 78675968, while the sum is 65.

The spelling of 842778874217 in words is "eight hundred forty-two billion, seven hundred seventy-eight million, eight hundred seventy-four thousand, two hundred seventeen".