666547500407 has 4 divisors (see below), whose sum is σ = 670961722416. Its totient is φ = 662133278400.

The previous prime is 666547500397. The next prime is 666547500419. The reversal of 666547500407 is 704005745666.

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 666547500407 - 2¹⁸ = 666547238263 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 (666547580407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2207110778 + ... + 2207111079.

It is an arithmetic number, because the mean of its divisors is an integer number (167740430604).

Almost surely, 2^666547500407 is an apocalyptic number.

666547500407 is a deficient number, since it is larger than the sum of its proper divisors (4414222009).

666547500407 is a wasteful number, since it uses less digits than its factorization.

666547500407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4414222008.

The product of its (nonzero) digits is 4233600, while the sum is 50.

The spelling of 666547500407 in words is "six hundred sixty-six billion, five hundred forty-seven million, five hundred thousand, four hundred seven".