665245902 has 16 divisors (see below), whose sum is σ = 1339304832. Its totient is φ = 220279800.

The previous prime is 665245901. The next prime is 665245909. The reversal of 665245902 is 209542566.

It is a super-2 number, since 2×665245902² = 885104220255587208, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665245901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 366228 + ... + 368039.

It is an arithmetic number, because the mean of its divisors is an integer number (83706552).

Almost surely, 2^665245902 is an apocalyptic number.

665245902 is an abundant number, since it is smaller than the sum of its proper divisors (674058930).

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

665245902 is a wasteful number, since it uses less digits than its factorization.

665245902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 734423.

The product of its (nonzero) digits is 129600, while the sum is 39.

The square root of 665245902 is about 25792.3613110549. The cubic root of 665245902 is about 872.9594472384.

The spelling of 665245902 in words is "six hundred sixty-five million, two hundred forty-five thousand, nine hundred two".