665874478494 has 40 divisors (see below), whose sum is σ = 1495091053368. Its totient is φ = 221506079760.

The previous prime is 665874478487. The next prime is 665874478579. The reversal of 665874478494 is 494874478566.

665874478494 is a `hidden beast` number, since 6 + 65 + 8 + 7 + 4 + 4 + 78 + 494 = 666.

665874478494 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×665874478494³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4106137 + ... + 4265220.

Almost surely, 2^665874478494 is an apocalyptic number.

665874478494 is an abundant number, since it is smaller than the sum of its proper divisors (829216574874).

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

665874478494 is a wasteful number, since it uses less digits than its factorization.

665874478494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8371862 (or 8371853 counting only the distinct ones).

The product of its digits is 1300561920, while the sum is 72.

Adding to 665874478494 its sum of digits (72), we get a palindrome (665874478566).

The spelling of 665874478494 in words is "six hundred sixty-five billion, eight hundred seventy-four million, four hundred seventy-eight thousand, four hundred ninety-four".