665366406 has 32 divisors (see below), whose sum is σ = 1356684000. Its totient is φ = 217486080.

The previous prime is 665366363. The next prime is 665366407. The reversal of 665366406 is 604663566.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665366407) 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, 125130 + ... + 130338.

It is an arithmetic number, because the mean of its divisors is an integer number (42396375).

Almost surely, 2^665366406 is an apocalyptic number.

665366406 is an abundant number, since it is smaller than the sum of its proper divisors (691317594).

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

665366406 is a wasteful number, since it uses less digits than its factorization.

665366406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5624.

The product of its (nonzero) digits is 466560, while the sum is 42.

The square root of 665366406 is about 25794.6972457519. The cubic root of 665366406 is about 873.0121539412.

The spelling of 665366406 in words is "six hundred sixty-five million, three hundred sixty-six thousand, four hundred six".