668511 has 6 divisors (see below), whose sum is σ = 965640. Its totient is φ = 445668.

The previous prime is 668509. The next prime is 668513. The reversal of 668511 is 115866.

It is an interprime number because it is at equal distance from previous prime (668509) and next prime (668513).

It is not a de Polignac number, because 668511 - 2¹ = 668509 is a prime.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668513) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37131 + ... + 37148.

It is an arithmetic number, because the mean of its divisors is an integer number (160940).

2⁶⁶⁸⁵¹¹ is an apocalyptic number.

668511 is a deficient number, since it is larger than the sum of its proper divisors (297129).

668511 is a wasteful number, since it uses less digits than its factorization.

668511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74285 (or 74282 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 668511 is about 817.6252197676. The cubic root of 668511 is about 87.4385309776.

The spelling of 668511 in words is "six hundred sixty-eight thousand, five hundred eleven".