665870152 has 8 divisors (see below), whose sum is σ = 1248506550. Its totient is φ = 332935072.

The previous prime is 665870099. The next prime is 665870201. The reversal of 665870152 is 251078566.

665870152 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 361228036 + 304642116 = 19006^2 + 17454^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41616877 + ... + 41616892.

Almost surely, 2^665870152 is an apocalyptic number.

It is an amenable number.

665870152 is a deficient number, since it is larger than the sum of its proper divisors (582636398).

665870152 is a wasteful number, since it uses less digits than its factorization.

665870152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83233775 (or 83233771 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 40.

The square root of 665870152 is about 25804.4599245944. The cubic root of 665870152 is about 873.2324162603.

The spelling of 665870152 in words is "six hundred sixty-five million, eight hundred seventy thousand, one hundred fifty-two".