665220107 has 4 divisors (see below), whose sum is σ = 665271840. Its totient is φ = 665168376.

The previous prime is 665220097. The next prime is 665220109. The reversal of 665220107 is 701022566.

665220107 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 665220107 - 2⁴ = 665220091 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 665220107.

It is not an unprimeable number, because it can be changed into a prime (665220109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9998 + ... + 37820.

It is an arithmetic number, because the mean of its divisors is an integer number (166317960).

Almost surely, 2^665220107 is an apocalyptic number.

665220107 is a deficient number, since it is larger than the sum of its proper divisors (51733).

665220107 is a wasteful number, since it uses less digits than its factorization.

665220107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51732.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 665220107 is about 25791.8612550549. The cubic root of 665220107 is about 872.9481640523.

The spelling of 665220107 in words is "six hundred sixty-five million, two hundred twenty thousand, one hundred seven".