842018665 has 4 divisors (see below), whose sum is σ = 1010422404. Its totient is φ = 673614928.

The previous prime is 842018633. The next prime is 842018669. The reversal of 842018665 is 566810248.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 381186576 + 460832089 = 19524^2 + 21467^2 .

It is a cyclic number.

It is not a de Polignac number, because 842018665 - 2⁵ = 842018633 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (842018669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84201862 + ... + 84201871.

It is an arithmetic number, because the mean of its divisors is an integer number (252605601).

Almost surely, 2^842018665 is an apocalyptic number.

It is an amenable number.

842018665 is a deficient number, since it is larger than the sum of its proper divisors (168403739).

842018665 is a wasteful number, since it uses less digits than its factorization.

842018665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168403738.

The product of its (nonzero) digits is 92160, while the sum is 40.

The square root of 842018665 is about 29017.5578745007. The cubic root of 842018665 is about 944.2940202745.

The spelling of 842018665 in words is "eight hundred forty-two million, eighteen thousand, six hundred sixty-five".