42775766539481 has 2 divisors, whose sum is σ = 42775766539482. Its totient is φ = 42775766539480.

The previous prime is 42775766539447. The next prime is 42775766539537. The reversal of 42775766539481 is 18493566757724.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41720747905600 + 1055018633881 = 6459160^2 + 1027141^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42775766539481 is a prime.

It is a super-2 number, since 2×42775766539481² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42775766539399 and 42775766539408.

It is not a weakly prime, because it can be changed into another prime (42775766539411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21387883269740 + 21387883269741.

It is an arithmetic number, because the mean of its divisors is an integer number (21387883269741).

Almost surely, 2^{42775766539481} is an apocalyptic number.

It is an amenable number.

42775766539481 is a deficient number, since it is larger than the sum of its proper divisors (1).

42775766539481 is an equidigital number, since it uses as much as digits as its factorization.

42775766539481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2133734400, while the sum is 74.

The spelling of 42775766539481 in words is "forty-two trillion, seven hundred seventy-five billion, seven hundred sixty-six million, five hundred thirty-nine thousand, four hundred eighty-one".