660794672129 has 2 divisors, whose sum is σ = 660794672130. Its totient is φ = 660794672128.

The previous prime is 660794672117. The next prime is 660794672147. The reversal of 660794672129 is 921276497066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 518042941504 + 142751730625 = 719752^2 + 377825^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-660794672129 is a prime.

It is not a weakly prime, because it can be changed into another prime (660794672189) 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 as a sum of consecutive naturals, namely, 330397336064 + 330397336065.

It is an arithmetic number, because the mean of its divisors is an integer number (330397336065).

Almost surely, 2^660794672129 is an apocalyptic number.

It is an amenable number.

660794672129 is a deficient number, since it is larger than the sum of its proper divisors (1).

660794672129 is an equidigital number, since it uses as much as digits as its factorization.

660794672129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13716864, while the sum is 59.

The spelling of 660794672129 in words is "six hundred sixty billion, seven hundred ninety-four million, six hundred seventy-two thousand, one hundred twenty-nine".