5518157509 has 2 divisors, whose sum is σ = 5518157510. Its totient is φ = 5518157508.

The previous prime is 5518157503. The next prime is 5518157521. The reversal of 5518157509 is 9057518155.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5021848225 + 496309284 = 70865^2 + 22278^2 .

It is a cyclic number.

It is not a de Polignac number, because 5518157509 - 2²¹ = 5516060357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5518157503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2759078754 + 2759078755.

It is an arithmetic number, because the mean of its divisors is an integer number (2759078755).

Almost surely, 2^5518157509 is an apocalyptic number.

It is an amenable number.

5518157509 is a deficient number, since it is larger than the sum of its proper divisors (1).

5518157509 is an equidigital number, since it uses as much as digits as its factorization.

5518157509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 315000, while the sum is 46.

The square root of 5518157509 is about 74284.3019015458. The cubic root of 5518157509 is about 1767.1145288458.

The spelling of 5518157509 in words is "five billion, five hundred eighteen million, one hundred fifty-seven thousand, five hundred nine".