663541263257 has 2 divisors, whose sum is σ = 663541263258. Its totient is φ = 663541263256.

The previous prime is 663541263223. The next prime is 663541263271. The reversal of 663541263257 is 752362145366.

663541263257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 621907309321 + 41633953936 = 788611^2 + 204044^2 .

It is a cyclic number.

It is not a de Polignac number, because 663541263257 - 2¹⁴ = 663541246873 is a prime.

It is not a weakly prime, because it can be changed into another prime (663541203257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331770631628 + 331770631629.

It is an arithmetic number, because the mean of its divisors is an integer number (331770631629).

Almost surely, 2^663541263257 is an apocalyptic number.

It is an amenable number.

663541263257 is a deficient number, since it is larger than the sum of its proper divisors (1).

663541263257 is an equidigital number, since it uses as much as digits as its factorization.

663541263257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5443200, while the sum is 50.

The spelling of 663541263257 in words is "six hundred sixty-three billion, five hundred forty-one million, two hundred sixty-three thousand, two hundred fifty-seven".