667784005679 has 16 divisors (see below), whose sum is σ = 773056512000. Its totient is φ = 565025497344.

The previous prime is 667784005673. The next prime is 667784005687. The reversal of 667784005679 is 976500487766.

It is not a de Polignac number, because 667784005679 - 2⁸ = 667784005423 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 (667784005673) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1710434 + ... + 2064255.

It is an arithmetic number, because the mean of its divisors is an integer number (48316032000).

Almost surely, 2^667784005679 is an apocalyptic number.

667784005679 is a deficient number, since it is larger than the sum of its proper divisors (105272506321).

667784005679 is a wasteful number, since it uses less digits than its factorization.

667784005679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3775022.

The product of its (nonzero) digits is 106686720, while the sum is 65.

The spelling of 667784005679 in words is "six hundred sixty-seven billion, seven hundred eighty-four million, five thousand, six hundred seventy-nine".