42556364549 has 2 divisors, whose sum is σ = 42556364550. Its totient is φ = 42556364548.

The previous prime is 42556364471. The next prime is 42556364569. The reversal of 42556364549 is 94546365524.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39952813924 + 2603550625 = 199882^2 + 51025^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42556364549 is a prime.

It is a super-2 number, since 2×42556364549² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 42556364549.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42556364569) 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 as a sum of consecutive naturals, namely, 21278182274 + 21278182275.

It is an arithmetic number, because the mean of its divisors is an integer number (21278182275).

Almost surely, 2^42556364549 is an apocalyptic number.

It is an amenable number.

42556364549 is a deficient number, since it is larger than the sum of its proper divisors (1).

42556364549 is an equidigital number, since it uses as much as digits as its factorization.

42556364549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552000, while the sum is 53.

The spelling of 42556364549 in words is "forty-two billion, five hundred fifty-six million, three hundred sixty-four thousand, five hundred forty-nine".