666652607 has 4 divisors (see below), whose sum is σ = 682156200. Its totient is φ = 651149016.

The previous prime is 666652573. The next prime is 666652619. The reversal of 666652607 is 706256666.

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 666652607 - 2¹⁶ = 666587071 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 (666652627) 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, 7751732 + ... + 7751817.

It is an arithmetic number, because the mean of its divisors is an integer number (170539050).

Almost surely, 2^666652607 is an apocalyptic number.

666652607 is a deficient number, since it is larger than the sum of its proper divisors (15503593).

666652607 is a wasteful number, since it uses less digits than its factorization.

666652607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15503592.

The product of its (nonzero) digits is 544320, while the sum is 44.

The square root of 666652607 is about 25819.6167090064. The cubic root of 666652607 is about 873.5743235681.

The spelling of 666652607 in words is "six hundred sixty-six million, six hundred fifty-two thousand, six hundred seven".