666731603 has 8 divisors (see below), whose sum is σ = 708773520. Its totient is φ = 625384800.

The previous prime is 666731599. The next prime is 666731617. The reversal of 666731603 is 306137666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 666731603 - 2² = 666731599 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666731693) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 171800 + ... + 175637.

It is an arithmetic number, because the mean of its divisors is an integer number (88596690).

Almost surely, 2^666731603 is an apocalyptic number.

666731603 is a deficient number, since it is larger than the sum of its proper divisors (42041917).

666731603 is a wasteful number, since it uses less digits than its factorization.

666731603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347557.

The product of its (nonzero) digits is 81648, while the sum is 38.

The square root of 666731603 is about 25821.1464307842. The cubic root of 666731603 is about 873.6088273716.

The spelling of 666731603 in words is "six hundred sixty-six million, seven hundred thirty-one thousand, six hundred three".