668503603 has 4 divisors (see below), whose sum is σ = 672238440. Its totient is φ = 664768768.

The previous prime is 668503601. The next prime is 668503637. The reversal of 668503603 is 306305866.

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

It is not a de Polignac number, because 668503603 - 2¹ = 668503601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668503601) 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, 1867150 + ... + 1867507.

It is an arithmetic number, because the mean of its divisors is an integer number (168059610).

Almost surely, 2^668503603 is an apocalyptic number.

668503603 is a deficient number, since it is larger than the sum of its proper divisors (3734837).

668503603 is a wasteful number, since it uses less digits than its factorization.

668503603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3734836.

The product of its (nonzero) digits is 77760, while the sum is 37.

The square root of 668503603 is about 25855.4366236581. The cubic root of 668503603 is about 874.3820847719.

The spelling of 668503603 in words is "six hundred sixty-eight million, five hundred three thousand, six hundred three".