665556365 has 8 divisors (see below), whose sum is σ = 817241568. Its totient is φ = 520062480.

The previous prime is 665556361. The next prime is 665556379. The reversal of 665556365 is 563655566.

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

It is not a de Polignac number, because 665556365 - 2² = 665556361 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665556361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1547591 + ... + 1548020.

It is an arithmetic number, because the mean of its divisors is an integer number (102155196).

Almost surely, 2^665556365 is an apocalyptic number.

It is an amenable number.

665556365 is a deficient number, since it is larger than the sum of its proper divisors (151685203).

665556365 is a wasteful number, since it uses less digits than its factorization.

665556365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3095659.

The product of its digits is 2430000, while the sum is 47.

The square root of 665556365 is about 25798.3791157507. The cubic root of 665556365 is about 873.0952263330.

The spelling of 665556365 in words is "six hundred sixty-five million, five hundred fifty-six thousand, three hundred sixty-five".