42078480557 has 2 divisors, whose sum is σ = 42078480558. Its totient is φ = 42078480556.

The previous prime is 42078480517. The next prime is 42078480569. The reversal of 42078480557 is 75508487024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29963956201 + 12114524356 = 173101^2 + 110066^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42078480557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42078480517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21039240278 + 21039240279.

It is an arithmetic number, because the mean of its divisors is an integer number (21039240279).

Almost surely, 2^42078480557 is an apocalyptic number.

It is an amenable number.

42078480557 is a deficient number, since it is larger than the sum of its proper divisors (1).

42078480557 is an equidigital number, since it uses as much as digits as its factorization.

42078480557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2508800, while the sum is 50.

The spelling of 42078480557 in words is "forty-two billion, seventy-eight million, four hundred eighty thousand, five hundred fifty-seven".