667187628871 has 4 divisors (see below), whose sum is σ = 696195786672. Its totient is φ = 638179471072.

The previous prime is 667187628851. The next prime is 667187628911. The reversal of 667187628871 is 178826781766.

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 667187628871 - 2⁷ = 667187628743 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 667187628797 and 667187628806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667187628851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14504078866 + ... + 14504078911.

It is an arithmetic number, because the mean of its divisors is an integer number (174048946668).

Almost surely, 2^667187628871 is an apocalyptic number.

667187628871 is a deficient number, since it is larger than the sum of its proper divisors (29008157801).

667187628871 is a wasteful number, since it uses less digits than its factorization.

667187628871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29008157800.

The product of its digits is 75866112, while the sum is 67.

The spelling of 667187628871 in words is "six hundred sixty-seven billion, one hundred eighty-seven million, six hundred twenty-eight thousand, eight hundred seventy-one".