667212428137 has 8 divisors (see below), whose sum is σ = 683724919752. Its totient is φ = 650711318400.

The previous prime is 667212428063. The next prime is 667212428203. The reversal of 667212428137 is 731824212766.

It can be written as a sum of positive squares in 4 ways, for example, as 33698312041 + 633514116096 = 183571^2 + 795936^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667212428137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667212420137) 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 7 ways as a sum of consecutive naturals, for example, 2726718 + ... + 2961319.

It is an arithmetic number, because the mean of its divisors is an integer number (85465614969).

Almost surely, 2^667212428137 is an apocalyptic number.

It is an amenable number.

667212428137 is a deficient number, since it is larger than the sum of its proper divisors (16512491615).

667212428137 is a wasteful number, since it uses less digits than its factorization.

667212428137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5690939.

The product of its digits is 1354752, while the sum is 49.

The spelling of 667212428137 in words is "six hundred sixty-seven billion, two hundred twelve million, four hundred twenty-eight thousand, one hundred thirty-seven".