663541261193 has 2 divisors, whose sum is σ = 663541261194. Its totient is φ = 663541261192.

The previous prime is 663541261189. The next prime is 663541261217. The reversal of 663541261193 is 391162145366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 381100032889 + 282441228304 = 617333^2 + 531452^2 .

It is a cyclic number.

It is not a de Polignac number, because 663541261193 - 2² = 663541261189 is a prime.

It is not a weakly prime, because it can be changed into another prime (663541261993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331770630596 + 331770630597.

It is an arithmetic number, because the mean of its divisors is an integer number (331770630597).

Almost surely, 2^663541261193 is an apocalyptic number.

It is an amenable number.

663541261193 is a deficient number, since it is larger than the sum of its proper divisors (1).

663541261193 is an equidigital number, since it uses as much as digits as its factorization.

663541261193 is an evil number, because the sum of its binary digits is even.

The product of its digits is 699840, while the sum is 47.

The spelling of 663541261193 in words is "six hundred sixty-three billion, five hundred forty-one million, two hundred sixty-one thousand, one hundred ninety-three".