665127107 has 4 divisors (see below), whose sum is σ = 665755056. Its totient is φ = 664499160.

The previous prime is 665127079. The next prime is 665127109. The reversal of 665127107 is 701721566.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 665127107 - 2⁸ = 665126851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665127109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 312383 + ... + 314504.

It is an arithmetic number, because the mean of its divisors is an integer number (166438764).

Almost surely, 2^665127107 is an apocalyptic number.

665127107 is a deficient number, since it is larger than the sum of its proper divisors (627949).

665127107 is a wasteful number, since it uses less digits than its factorization.

665127107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 627948.

The product of its (nonzero) digits is 17640, while the sum is 35.

The square root of 665127107 is about 25790.0582977240. The cubic root of 665127107 is about 872.9074817969.

The spelling of 665127107 in words is "six hundred sixty-five million, one hundred twenty-seven thousand, one hundred seven".