665556105 has 8 divisors (see below), whose sum is σ = 1064889792. Its totient is φ = 354963248.

The previous prime is 665556041. The next prime is 665556109. The reversal of 665556105 is 501655566.

665556105 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 665556105 - 2⁶ = 665556041 is a prime.

It is not an unprimeable number, because it can be changed into a prime (665556109) 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, 22185189 + ... + 22185218.

It is an arithmetic number, because the mean of its divisors is an integer number (133111224).

Almost surely, 2^665556105 is an apocalyptic number.

It is an amenable number.

665556105 is a deficient number, since it is larger than the sum of its proper divisors (399333687).

665556105 is a wasteful number, since it uses less digits than its factorization.

665556105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44370415.

The product of its (nonzero) digits is 135000, while the sum is 39.

The square root of 665556105 is about 25798.3740766739. The cubic root of 665556105 is about 873.0951126413.

The spelling of 665556105 in words is "six hundred sixty-five million, five hundred fifty-six thousand, one hundred five".