665970 has 32 divisors (see below), whose sum is σ = 1624320. Its totient is φ = 174720.

The previous prime is 665953. The next prime is 665981. The reversal of 665970 is 79566.

665970 = T₂₄₈ + T₂₄₉ + ... + T₂₆₇.

It is an unprimeable number.

665970 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 15 ways as a sum of consecutive naturals, for example, 2230 + ... + 2510.

It is an arithmetic number, because the mean of its divisors is an integer number (50760).

2⁶⁶⁵⁹⁷⁰ is an apocalyptic number.

665970 is an abundant number, since it is smaller than the sum of its proper divisors (958350).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665970 is a wasteful number, since it uses less digits than its factorization.

665970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370.

The product of its (nonzero) digits is 11340, while the sum is 33.

The square root of 665970 is about 816.0698499516. The cubic root of 665970 is about 87.3276061483.

The spelling of 665970 in words is "six hundred sixty-five thousand, nine hundred seventy".