67666190671 has 4 divisors (see below), whose sum is σ = 67676205744. Its totient is φ = 67656175600.

The previous prime is 67666190659. The next prime is 67666190701. The reversal of 67666190671 is 17609166676.

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 67666190671 - 2⁵ = 67666190639 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 (67666190611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4997395 + ... + 5010916.

It is an arithmetic number, because the mean of its divisors is an integer number (16919051436).

Almost surely, 2^67666190671 is an apocalyptic number.

67666190671 is a deficient number, since it is larger than the sum of its proper divisors (10015073).

67666190671 is a wasteful number, since it uses less digits than its factorization.

67666190671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10015072.

The product of its (nonzero) digits is 3429216, while the sum is 55.

The spelling of 67666190671 in words is "sixty-seven billion, six hundred sixty-six million, one hundred ninety thousand, six hundred seventy-one".