633666203725397 has 2 divisors, whose sum is σ = 633666203725398. Its totient is φ = 633666203725396.

The previous prime is 633666203725367. The next prime is 633666203725417. The reversal of 633666203725397 is 793527302666336.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 523616998217041 + 110049205508356 = 22882679^2 + 10490434^2 .

It is a cyclic number.

It is not a de Polignac number, because 633666203725397 - 2¹⁸ = 633666203463253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (633666203725367) 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, 316833101862698 + 316833101862699.

It is an arithmetic number, because the mean of its divisors is an integer number (316833101862699).

Almost surely, 2^{633666203725397} is an apocalyptic number.

It is an amenable number.

633666203725397 is a deficient number, since it is larger than the sum of its proper divisors (1).

633666203725397 is an equidigital number, since it uses as much as digits as its factorization.

633666203725397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 925888320, while the sum is 68.

The spelling of 633666203725397 in words is "six hundred thirty-three trillion, six hundred sixty-six billion, two hundred three million, seven hundred twenty-five thousand, three hundred ninety-seven".