661304003 has 8 divisors (see below), whose sum is σ = 671622672. Its totient is φ = 650998656.

The previous prime is 661303991. The next prime is 661304057. The reversal of 661304003 is 300403166.

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 661304003 - 2¹⁶ = 661238467 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 661304003.

It is not an unprimeable number, because it can be changed into a prime (661304093) 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, 151751 + ... + 156047.

It is an arithmetic number, because the mean of its divisors is an integer number (83952834).

Almost surely, 2^661304003 is an apocalyptic number.

661304003 is a deficient number, since it is larger than the sum of its proper divisors (10318669).

661304003 is a wasteful number, since it uses less digits than its factorization.

661304003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6661.

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 661304003 is about 25715.8317578880. The cubic root of 661304003 is about 871.2317967663.

Adding to 661304003 its reverse (300403166), we get a palindrome (961707169).

The spelling of 661304003 in words is "six hundred sixty-one million, three hundred four thousand, three".