56556380549 has 2 divisors, whose sum is σ = 56556380550. Its totient is φ = 56556380548.

The previous prime is 56556380497. The next prime is 56556380557. The reversal of 56556380549 is 94508365565.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42991119649 + 13565260900 = 207343^2 + 116470^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56556380549 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 56556380494 and 56556380503.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56556320549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28278190274 + 28278190275.

It is an arithmetic number, because the mean of its divisors is an integer number (28278190275).

Almost surely, 2^56556380549 is an apocalyptic number.

It is an amenable number.

56556380549 is a deficient number, since it is larger than the sum of its proper divisors (1).

56556380549 is an equidigital number, since it uses as much as digits as its factorization.

56556380549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440000, while the sum is 56.

The spelling of 56556380549 in words is "fifty-six billion, five hundred fifty-six million, three hundred eighty thousand, five hundred forty-nine".