656211118397 has 2 divisors, whose sum is σ = 656211118398. Its totient is φ = 656211118396.

The previous prime is 656211118363. The next prime is 656211118403. The reversal of 656211118397 is 793811112656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 655688584516 + 522533881 = 809746^2 + 22859^2 .

It is a cyclic number.

It is not a de Polignac number, because 656211118397 - 2⁶ = 656211118333 is a prime.

It is a super-2 number, since 2×656211118397² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (656211118327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328105559198 + 328105559199.

It is an arithmetic number, because the mean of its divisors is an integer number (328105559199).

Almost surely, 2^656211118397 is an apocalyptic number.

It is an amenable number.

656211118397 is a deficient number, since it is larger than the sum of its proper divisors (1).

656211118397 is an equidigital number, since it uses as much as digits as its factorization.

656211118397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 544320, while the sum is 50.

The spelling of 656211118397 in words is "six hundred fifty-six billion, two hundred eleven million, one hundred eighteen thousand, three hundred ninety-seven".