665874478503 has 12 divisors (see below), whose sum is σ = 1035804744520. Its totient is φ = 409768909776.

The previous prime is 665874478487. The next prime is 665874478579. The reversal of 665874478503 is 305874478566.

665874478503 is a `hidden beast` number, since 6 + 6 + 5 + 87 + 4 + 47 + 8 + 503 = 666.

665874478503 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 665874478503 - 2⁴ = 665874478487 is a prime.

It is a super-2 number, since 2×665874478503² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665874478603) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2845617313 + ... + 2845617546.

Almost surely, 2^665874478503 is an apocalyptic number.

665874478503 is a deficient number, since it is larger than the sum of its proper divisors (369930266017).

665874478503 is a wasteful number, since it uses less digits than its factorization.

665874478503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5691234878 (or 5691234875 counting only the distinct ones).

The product of its (nonzero) digits is 135475200, while the sum is 63.

Adding to 665874478503 its sum of digits (63), we get a palindrome (665874478566).

The spelling of 665874478503 in words is "six hundred sixty-five billion, eight hundred seventy-four million, four hundred seventy-eight thousand, five hundred three".