666465 has 16 divisors (see below), whose sum is σ = 1076928. Its totient is φ = 351936.

The previous prime is 666461. The next prime is 666467. The reversal of 666465 is 564666.

It is not a de Polignac number, because 666465 - 2² = 666461 is a prime.

It is not an unprimeable number, because it can be changed into a prime (666461) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2214 + ... + 2496.

It is an arithmetic number, because the mean of its divisors is an integer number (67308).

2⁶⁶⁶⁴⁶⁵ is an apocalyptic number.

It is an amenable number.

666465 is a deficient number, since it is larger than the sum of its proper divisors (410463).

666465 is a wasteful number, since it uses less digits than its factorization.

666465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 448.

The product of its digits is 25920, while the sum is 33.

The square root of 666465 is about 816.3730764791. The cubic root of 666465 is about 87.3492369823.

The spelling of 666465 in words is "six hundred sixty-six thousand, four hundred sixty-five".