56623505509 has 2 divisors, whose sum is σ = 56623505510. Its totient is φ = 56623505508.

The previous prime is 56623505473. The next prime is 56623505563. The reversal of 56623505509 is 90550532665.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40359604609 + 16263900900 = 200897^2 + 127530^2 .

It is a cyclic number.

It is not a de Polignac number, because 56623505509 - 2⁷ = 56623505381 is a prime.

It is a super-2 number, since 2×56623505509² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56623505569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28311752754 + 28311752755.

It is an arithmetic number, because the mean of its divisors is an integer number (28311752755).

Almost surely, 2^56623505509 is an apocalyptic number.

It is an amenable number.

56623505509 is a deficient number, since it is larger than the sum of its proper divisors (1).

56623505509 is an equidigital number, since it uses as much as digits as its factorization.

56623505509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1215000, while the sum is 46.

The spelling of 56623505509 in words is "fifty-six billion, six hundred twenty-three million, five hundred five thousand, five hundred nine".