665501107 has 4 divisors (see below), whose sum is σ = 665825760. Its totient is φ = 665176456.

The previous prime is 665501101. The next prime is 665501117. The reversal of 665501107 is 701105566.

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 665501107 - 2³ = 665501099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665501101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 159232 + ... + 163357.

It is an arithmetic number, because the mean of its divisors is an integer number (166456440).

Almost surely, 2^665501107 is an apocalyptic number.

665501107 is a deficient number, since it is larger than the sum of its proper divisors (324653).

665501107 is a wasteful number, since it uses less digits than its factorization.

665501107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324652.

The product of its (nonzero) digits is 6300, while the sum is 31.

The square root of 665501107 is about 25797.3081347648. The cubic root of 665501107 is about 873.0710626740.

The spelling of 665501107 in words is "six hundred sixty-five million, five hundred one thousand, one hundred seven".