666351 has 18 divisors (see below), whose sum is σ = 1120392. Its totient is φ = 380520.

The previous prime is 666329. The next prime is 666353. The reversal of 666351 is 153666.

It is not a de Polignac number, because 666351 - 2¹³ = 658159 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 666351.

It is not an unprimeable number, because it can be changed into a prime (666353) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 315 + ... + 1196.

It is an arithmetic number, because the mean of its divisors is an integer number (62244).

2⁶⁶⁶³⁵¹ is an apocalyptic number.

666351 is a deficient number, since it is larger than the sum of its proper divisors (454041).

666351 is a wasteful number, since it uses less digits than its factorization.

666351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1531 (or 1521 counting only the distinct ones).

The product of its digits is 3240, while the sum is 27.

The square root of 666351 is about 816.3032524742. The cubic root of 666351 is about 87.3442562852.

The spelling of 666351 in words is "six hundred sixty-six thousand, three hundred fifty-one".