666670067407 has 4 divisors (see below), whose sum is σ = 666671913936. Its totient is φ = 666668220880.

The previous prime is 666670067381. The next prime is 666670067443. The reversal of 666670067407 is 704760076666.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666670067407 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 (666670062407) 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, 184843 + ... + 1169404.

It is an arithmetic number, because the mean of its divisors is an integer number (166667978484).

Almost surely, 2^666670067407 is an apocalyptic number.

666670067407 is a deficient number, since it is larger than the sum of its proper divisors (1846529).

666670067407 is a wasteful number, since it uses less digits than its factorization.

666670067407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1846528.

The product of its (nonzero) digits is 10668672, while the sum is 55.

The spelling of 666670067407 in words is "six hundred sixty-six billion, six hundred seventy million, sixty-seven thousand, four hundred seven".