666016607 has 4 divisors (see below), whose sum is σ = 666076680. Its totient is φ = 665956536.

The previous prime is 666016601. The next prime is 666016609. The reversal of 666016607 is 706610666.

It is a happy number.

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 666016607 - 2²² = 661822303 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 (666016601) 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, 8033 + ... + 37370.

It is an arithmetic number, because the mean of its divisors is an integer number (166519170).

Almost surely, 2^666016607 is an apocalyptic number.

666016607 is a deficient number, since it is larger than the sum of its proper divisors (60073).

666016607 is a wasteful number, since it uses less digits than its factorization.

666016607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60072.

The product of its (nonzero) digits is 54432, while the sum is 38.

The square root of 666016607 is about 25807.2975532116. The cubic root of 666016607 is about 873.2964326845.

The spelling of 666016607 in words is "six hundred sixty-six million, sixteen thousand, six hundred seven".