718666 has 16 divisors (see below), whose sum is σ = 1175328. Its totient is φ = 327600.

The previous prime is 718661. The next prime is 718691. The reversal of 718666 is 666817.

It is not an unprimeable number, because it can be changed into a prime (718661) by changing a digit.

718666 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3301 + ... + 3511.

It is an arithmetic number, because the mean of its divisors is an integer number (73458).

2⁷¹⁸⁶⁶⁶ is an apocalyptic number.

718666 is a deficient number, since it is larger than the sum of its proper divisors (456662).

718666 is a wasteful number, since it uses less digits than its factorization.

718666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357.

The product of its digits is 12096, while the sum is 34.

The square root of 718666 is about 847.7417059459. The cubic root of 718666 is about 89.5727070624.

The spelling of 718666 in words is "seven hundred eighteen thousand, six hundred sixty-six".