397518216519433 has 2 divisors, whose sum is σ = 397518216519434. Its totient is φ = 397518216519432.

The previous prime is 397518216519407. The next prime is 397518216519461. The reversal of 397518216519433 is 334915612815793.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 394262801026704 + 3255415492729 = 19856052^2 + 1804277^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-397518216519433 is a prime.

It is not a weakly prime, because it can be changed into another prime (397518216511433) 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 as a sum of consecutive naturals, namely, 198759108259716 + 198759108259717.

It is an arithmetic number, because the mean of its divisors is an integer number (198759108259717).

Almost surely, 2^{397518216519433} is an apocalyptic number.

It is an amenable number.

397518216519433 is a deficient number, since it is larger than the sum of its proper divisors (1).

397518216519433 is an equidigital number, since it uses as much as digits as its factorization.

397518216519433 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 146966400, while the sum is 67.

The spelling of 397518216519433 in words is "three hundred ninety-seven trillion, five hundred eighteen billion, two hundred sixteen million, five hundred nineteen thousand, four hundred thirty-three".