668997041 has 8 divisors (see below), whose sum is σ = 686128968. Its totient is φ = 651904000.

The previous prime is 668997029. The next prime is 668997059. The reversal of 668997041 is 140799866.

It can be written as a sum of positive squares in 4 ways, for example, as 54700816 + 614296225 = 7396^2 + 24785^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-668997041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668997061) by changing a digit.

It is a Zeisel number, with parameters (21, 20).

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26861 + ... + 45381.

It is an arithmetic number, because the mean of its divisors is an integer number (85766121).

Almost surely, 2^668997041 is an apocalyptic number.

It is an amenable number.

668997041 is a deficient number, since it is larger than the sum of its proper divisors (17131927).

668997041 is a wasteful number, since it uses less digits than its factorization.

668997041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19443.

The product of its (nonzero) digits is 653184, while the sum is 50.

The square root of 668997041 is about 25864.9771119172. The cubic root of 668997041 is about 874.5971657545.

The spelling of 668997041 in words is "six hundred sixty-eight million, nine hundred ninety-seven thousand, forty-one".