668541 has 8 divisors (see below), whose sum is σ = 930240. Its totient is φ = 426272.

The previous prime is 668539. The next prime is 668543. The reversal of 668541 is 145866.

It is an interprime number because it is at equal distance from previous prime (668539) and next prime (668543).

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 668541 - 2¹ = 668539 is a prime.

It is a plaindrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 668499 and 668508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668543) 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, 4776 + ... + 4913.

It is an arithmetic number, because the mean of its divisors is an integer number (116280).

2⁶⁶⁸⁵⁴¹ is an apocalyptic number.

It is an amenable number.

668541 is a deficient number, since it is larger than the sum of its proper divisors (261699).

668541 is a wasteful number, since it uses less digits than its factorization.

668541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9715.

The product of its digits is 5760, while the sum is 30.

The square root of 668541 is about 817.6435653755. The cubic root of 668541 is about 87.4398389175.

The spelling of 668541 in words is "six hundred sixty-eight thousand, five hundred forty-one".