122643665563 has 2 divisors, whose sum is σ = 122643665564. Its totient is φ = 122643665562.

The previous prime is 122643665503. The next prime is 122643665581. The reversal of 122643665563 is 365566346221.

It is a strong prime.

It is an emirp because it is prime and its reverse (365566346221) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-122643665563 is a prime.

It is not a weakly prime, because it can be changed into another prime (122643665503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61321832781 + 61321832782.

It is an arithmetic number, because the mean of its divisors is an integer number (61321832782).

Almost surely, 2^122643665563 is an apocalyptic number.

122643665563 is a deficient number, since it is larger than the sum of its proper divisors (1).

122643665563 is an equidigital number, since it uses as much as digits as its factorization.

122643665563 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4665600, while the sum is 49.

The spelling of 122643665563 in words is "one hundred twenty-two billion, six hundred forty-three million, six hundred sixty-five thousand, five hundred sixty-three".