7478316557 has 2 divisors, whose sum is σ = 7478316558. Its totient is φ = 7478316556.

The previous prime is 7478316551. The next prime is 7478316569. The reversal of 7478316557 is 7556138747.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6313732681 + 1164583876 = 79459^2 + 34126^2 .

It is a cyclic number.

It is not a de Polignac number, because 7478316557 - 2¹⁴ = 7478300173 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7478316499 and 7478316508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7478316551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3739158278 + 3739158279.

It is an arithmetic number, because the mean of its divisors is an integer number (3739158279).

Almost surely, 2^7478316557 is an apocalyptic number.

It is an amenable number.

7478316557 is a deficient number, since it is larger than the sum of its proper divisors (1).

7478316557 is an equidigital number, since it uses as much as digits as its factorization.

7478316557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4939200, while the sum is 53.

The square root of 7478316557 is about 86477.2603462899. The cubic root of 7478316557 is about 1955.5456039598.

The spelling of 7478316557 in words is "seven billion, four hundred seventy-eight million, three hundred sixteen thousand, five hundred fifty-seven".