665298676 has 18 divisors (see below), whose sum is σ = 1354358418. Its totient is φ = 285127920.

The previous prime is 665298671. The next prime is 665298679. The reversal of 665298676 is 676892566.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 611276176 + 54022500 = 24724^2 + 7350^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665298671) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1696995 + ... + 1697386.

Almost surely, 2^665298676 is an apocalyptic number.

It is an amenable number.

665298676 is an abundant number, since it is smaller than the sum of its proper divisors (689059742).

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

665298676 is a wasteful number, since it uses less digits than its factorization.

665298676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3394399 (or 3394390 counting only the distinct ones).

The product of its digits is 6531840, while the sum is 55.

The square root of 665298676 is about 25793.3843456030. The cubic root of 665298676 is about 872.9825306043.

The spelling of 665298676 in words is "six hundred sixty-five million, two hundred ninety-eight thousand, six hundred seventy-six".