56623506509 has 2 divisors, whose sum is σ = 56623506510. Its totient is φ = 56623506508.

The previous prime is 56623506493. The next prime is 56623506553. The reversal of 56623506509 is 90560532665.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51688022500 + 4935484009 = 227350^2 + 70253^2 .

It is a cyclic number.

It is not a de Polignac number, because 56623506509 - 2⁴ = 56623506493 is a prime.

It is a super-3 number, since 3×56623506509³ (a number of 33 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56623505509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28311753254 + 28311753255.

It is an arithmetic number, because the mean of its divisors is an integer number (28311753255).

Almost surely, 2^56623506509 is an apocalyptic number.

It is an amenable number.

56623506509 is a deficient number, since it is larger than the sum of its proper divisors (1).

56623506509 is an equidigital number, since it uses as much as digits as its factorization.

56623506509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1458000, while the sum is 47.

The spelling of 56623506509 in words is "fifty-six billion, six hundred twenty-three million, five hundred six thousand, five hundred nine".