123320780563 has 2 divisors, whose sum is σ = 123320780564. Its totient is φ = 123320780562.

The previous prime is 123320780521. The next prime is 123320780573. The reversal of 123320780563 is 365087023321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 123320780563 - 2¹³ = 123320772371 is a prime.

It is not a weakly prime, because it can be changed into another prime (123320780573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61660390281 + 61660390282.

It is an arithmetic number, because the mean of its divisors is an integer number (61660390282).

Almost surely, 2^123320780563 is an apocalyptic number.

123320780563 is a deficient number, since it is larger than the sum of its proper divisors (1).

123320780563 is an equidigital number, since it uses as much as digits as its factorization.

123320780563 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 181440, while the sum is 40.

The spelling of 123320780563 in words is "one hundred twenty-three billion, three hundred twenty million, seven hundred eighty thousand, five hundred sixty-three".