56442443521 has 2 divisors, whose sum is σ = 56442443522. Its totient is φ = 56442443520.

The previous prime is 56442443507. The next prime is 56442443549. The reversal of 56442443521 is 12534424465.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40733330625 + 15709112896 = 201825^2 + 125336^2 .

It is a cyclic number.

It is not a de Polignac number, because 56442443521 - 2⁵ = 56442443489 is a prime.

It is not a weakly prime, because it can be changed into another prime (56442443821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28221221760 + 28221221761.

It is an arithmetic number, because the mean of its divisors is an integer number (28221221761).

Almost surely, 2^56442443521 is an apocalyptic number.

It is an amenable number.

56442443521 is a deficient number, since it is larger than the sum of its proper divisors (1).

56442443521 is an equidigital number, since it uses as much as digits as its factorization.

56442443521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 460800, while the sum is 40.

Adding to 56442443521 its reverse (12534424465), we get a palindrome (68976867986).

The spelling of 56442443521 in words is "fifty-six billion, four hundred forty-two million, four hundred forty-three thousand, five hundred twenty-one".