656243126117 has 2 divisors, whose sum is σ = 656243126118. Its totient is φ = 656243126116.

The previous prime is 656243126089. The next prime is 656243126137. The reversal of 656243126117 is 711621342656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 472025335681 + 184217790436 = 687041^2 + 429206^2 .

It is a cyclic number.

It is not a de Polignac number, because 656243126117 - 2¹⁴ = 656243109733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (656243126137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328121563058 + 328121563059.

It is an arithmetic number, because the mean of its divisors is an integer number (328121563059).

Almost surely, 2^656243126117 is an apocalyptic number.

It is an amenable number.

656243126117 is a deficient number, since it is larger than the sum of its proper divisors (1).

656243126117 is an equidigital number, since it uses as much as digits as its factorization.

656243126117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 44.

The spelling of 656243126117 in words is "six hundred fifty-six billion, two hundred forty-three million, one hundred twenty-six thousand, one hundred seventeen".