667871903 has 4 divisors (see below), whose sum is σ = 667923720. Its totient is φ = 667820088.

The previous prime is 667871891. The next prime is 667871933. The reversal of 667871903 is 309178766.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 667871903 - 2⁶ = 667871839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667871933) 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, 10208 + ... + 37946.

It is an arithmetic number, because the mean of its divisors is an integer number (166980930).

Almost surely, 2^667871903 is an apocalyptic number.

667871903 is a deficient number, since it is larger than the sum of its proper divisors (51817).

667871903 is a wasteful number, since it uses less digits than its factorization.

667871903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51816.

The product of its (nonzero) digits is 381024, while the sum is 47.

The square root of 667871903 is about 25843.2177369615. The cubic root of 667871903 is about 874.1065832731.

The spelling of 667871903 in words is "six hundred sixty-seven million, eight hundred seventy-one thousand, nine hundred three".