665065000 has 40 divisors (see below), whose sum is σ = 1558259010. Its totient is φ = 266024000.

The previous prime is 665064997. The next prime is 665065021. The reversal of 665065000 is 560566.

It can be written as a sum of positive squares in 5 ways, for example, as 8988004 + 656076996 = 2998^2 + 25614^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×665065000² = 884622908450000000, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 665065000.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 61507 + ... + 71506.

Almost surely, 2^665065000 is an apocalyptic number.

It is an amenable number.

665065000 is an abundant number, since it is smaller than the sum of its proper divisors (893194010).

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

665065000 is a wasteful number, since it uses less digits than its factorization.

665065000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133039 (or 133020 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 665065000 is about 25788.8541816033. The cubic root of 665065000 is about 872.8803113749.

The spelling of 665065000 in words is "six hundred sixty-five million, sixty-five thousand".