668741 has 2 divisors, whose sum is σ = 668742. Its totient is φ = 668740.

The previous prime is 668737. The next prime is 668747. The reversal of 668741 is 147866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 556516 + 112225 = 746^2 + 335^2 .

It is a cyclic number.

It is not a de Polignac number, because 668741 - 2² = 668737 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 668698 and 668707.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334370 + 334371.

It is an arithmetic number, because the mean of its divisors is an integer number (334371).

2⁶⁶⁸⁷⁴¹ is an apocalyptic number.

It is an amenable number.

668741 is a deficient number, since it is larger than the sum of its proper divisors (1).

668741 is an equidigital number, since it uses as much as digits as its factorization.

668741 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 32.

The square root of 668741 is about 817.7658589107. The cubic root of 668741 is about 87.4485575173.

The spelling of 668741 in words is "six hundred sixty-eight thousand, seven hundred forty-one".