665194036 has 24 divisors (see below), whose sum is σ = 1254532104. Its totient is φ = 306792960.

The previous prime is 665194021. The next prime is 665194039. The reversal of 665194036 is 630491566.

It can be written as a sum of positive squares in 4 ways, for example, as 1822500 + 663371536 = 1350^2 + 25756^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 665194036.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665194039) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85776 + ... + 93208.

It is an arithmetic number, because the mean of its divisors is an integer number (52272171).

Almost surely, 2^665194036 is an apocalyptic number.

It is an amenable number.

665194036 is a deficient number, since it is larger than the sum of its proper divisors (589338068).

665194036 is a wasteful number, since it uses less digits than its factorization.

665194036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9171 (or 9169 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 40.

The square root of 665194036 is about 25791.3558387302. The cubic root of 665194036 is about 872.9367598425.

The spelling of 665194036 in words is "six hundred sixty-five million, one hundred ninety-four thousand, thirty-six".