666260 has 24 divisors (see below), whose sum is σ = 1599360. Its totient is φ = 228384.

The previous prime is 666233. The next prime is 666269. The reversal of 666260 is 62666.

666260 = T₅₆ + T₅₇ + ... + T₁₆₀.

It is an Ulam number.

It is a nialpdrome in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666269) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2240 + ... + 2519.

It is an arithmetic number, because the mean of its divisors is an integer number (66640).

2⁶⁶⁶²⁶⁰ is an apocalyptic number.

It is an amenable number.

666260 is an abundant number, since it is smaller than the sum of its proper divisors (933100).

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

666260 is a wasteful number, since it uses less digits than its factorization.

666260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4775 (or 4773 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 666260 is about 816.2475114817. The cubic root of 666260 is about 87.3402800579.

It can be divided in two parts, 6 and 66260, that added together give a palindrome (66266).

The spelling of 666260 in words is "six hundred sixty-six thousand, two hundred sixty".