663881765543 has 2 divisors, whose sum is σ = 663881765544. Its totient is φ = 663881765542.

The previous prime is 663881765483. The next prime is 663881765551. The reversal of 663881765543 is 345567188366.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 663881765543 - 2³⁴ = 646701896359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (663881765563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331940882771 + 331940882772.

It is an arithmetic number, because the mean of its divisors is an integer number (331940882772).

Almost surely, 2^663881765543 is an apocalyptic number.

663881765543 is a deficient number, since it is larger than the sum of its proper divisors (1).

663881765543 is an equidigital number, since it uses as much as digits as its factorization.

663881765543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 87091200, while the sum is 62.

The spelling of 663881765543 in words is "six hundred sixty-three billion, eight hundred eighty-one million, seven hundred sixty-five thousand, five hundred forty-three".