665004785 has 8 divisors (see below), whose sum is σ = 798201000. Its totient is φ = 531873664.

The previous prime is 665004763. The next prime is 665004787. The reversal of 665004785 is 587400566.

It can be written as a sum of positive squares in 4 ways, for example, as 102556129 + 562448656 = 10127^2 + 23716^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665004785 is a prime.

It is not an unprimeable number, because it can be changed into a prime (665004787) 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, 10091 + ... + 37839.

It is an arithmetic number, because the mean of its divisors is an integer number (99775125).

Almost surely, 2^665004785 is an apocalyptic number.

It is an amenable number.

665004785 is a deficient number, since it is larger than the sum of its proper divisors (133196215).

665004785 is a wasteful number, since it uses less digits than its factorization.

665004785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32547.

The product of its (nonzero) digits is 201600, while the sum is 41.

The square root of 665004785 is about 25787.6866934590. The cubic root of 665004785 is about 872.8539670455.

The spelling of 665004785 in words is "six hundred sixty-five million, four thousand, seven hundred eighty-five".