667666758191 has 8 divisors (see below), whose sum is σ = 691156827264. Its totient is φ = 644298716160.

The previous prime is 667666758181. The next prime is 667666758197. The reversal of 667666758191 is 191857666766.

667666758191 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 667666758191 - 2³⁰ = 666593016367 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 (667666758197) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30495626 + ... + 30517511.

It is an arithmetic number, because the mean of its divisors is an integer number (86394603408).

Almost surely, 2^667666758191 is an apocalyptic number.

667666758191 is a deficient number, since it is larger than the sum of its proper divisors (23490069073).

667666758191 is a wasteful number, since it uses less digits than its factorization.

667666758191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61013521.

The product of its digits is 137168640, while the sum is 68.

The spelling of 667666758191 in words is "six hundred sixty-seven billion, six hundred sixty-six million, seven hundred fifty-eight thousand, one hundred ninety-one".