666879903 has 6 divisors (see below), whose sum is σ = 963270984. Its totient is φ = 444586596.

The previous prime is 666879901. The next prime is 666879929. The reversal of 666879903 is 309978666.

It is a happy number.

It is not a de Polignac number, because 666879903 - 2¹ = 666879901 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 666879903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666879901) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37048875 + ... + 37048892.

It is an arithmetic number, because the mean of its divisors is an integer number (160545164).

Almost surely, 2^666879903 is an apocalyptic number.

666879903 is a deficient number, since it is larger than the sum of its proper divisors (296391081).

666879903 is a wasteful number, since it uses less digits than its factorization.

666879903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74097773 (or 74097770 counting only the distinct ones).

The product of its (nonzero) digits is 2939328, while the sum is 54.

The square root of 666879903 is about 25824.0179484138. The cubic root of 666879903 is about 873.6735943553.

The spelling of 666879903 in words is "six hundred sixty-six million, eight hundred seventy-nine thousand, nine hundred three".