397518216519461 has 2 divisors, whose sum is σ = 397518216519462. Its totient is φ = 397518216519460.

The previous prime is 397518216519433. The next prime is 397518216519481. The reversal of 397518216519461 is 164915612815793.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 315376078486561 + 82142138032900 = 17758831^2 + 9063230^2 .

It is a cyclic number.

It is not a de Polignac number, because 397518216519461 - 2²⁶ = 397518149410597 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 397518216519391 and 397518216519400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397518216519481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198759108259730 + 198759108259731.

It is an arithmetic number, because the mean of its divisors is an integer number (198759108259731).

Almost surely, 2^{397518216519461} is an apocalyptic number.

It is an amenable number.

397518216519461 is a deficient number, since it is larger than the sum of its proper divisors (1).

397518216519461 is an equidigital number, since it uses as much as digits as its factorization.

397518216519461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 97977600, while the sum is 68.

The spelling of 397518216519461 in words is "three hundred ninety-seven trillion, five hundred eighteen billion, two hundred sixteen million, five hundred nineteen thousand, four hundred sixty-one".