123565345563 has 128 divisors (see below), whose sum is σ = 197399669760. Its totient is φ = 68487936000.

The previous prime is 123565345537. The next prime is 123565345571. The reversal of 123565345563 is 365543565321.

It is not a de Polignac number, because 123565345563 - 2²⁰ = 123564296987 is a prime.

It is a super-3 number, since 3×123565345563³ (a number of 34 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (123565345663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 459350593 + ... + 459350861.

It is an arithmetic number, because the mean of its divisors is an integer number (1542184920).

Almost surely, 2^123565345563 is an apocalyptic number.

123565345563 is a deficient number, since it is larger than the sum of its proper divisors (73834324197).

123565345563 is a wasteful number, since it uses less digits than its factorization.

123565345563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490 (or 468 counting only the distinct ones).

The product of its digits is 4860000, while the sum is 48.

The spelling of 123565345563 in words is "one hundred twenty-three billion, five hundred sixty-five million, three hundred forty-five thousand, five hundred sixty-three".