665253606 has 16 divisors (see below), whose sum is σ = 1330935984. Its totient is φ = 221679744.

The previous prime is 665253601. The next prime is 665253607. The reversal of 665253606 is 606352566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665253601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4450 + ... + 36746.

It is an arithmetic number, because the mean of its divisors is an integer number (83183499).

Almost surely, 2^665253606 is an apocalyptic number.

665253606 is an abundant number, since it is smaller than the sum of its proper divisors (665682378).

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

665253606 is a wasteful number, since it uses less digits than its factorization.

665253606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35735.

The product of its (nonzero) digits is 194400, while the sum is 39.

The square root of 665253606 is about 25792.5106571656. The cubic root of 665253606 is about 872.9628170468.

The spelling of 665253606 in words is "six hundred sixty-five million, two hundred fifty-three thousand, six hundred six".