5115561637 has 2 divisors, whose sum is σ = 5115561638. Its totient is φ = 5115561636.

The previous prime is 5115561623. The next prime is 5115561673. The reversal of 5115561637 is 7361655115.

It is a happy number.

Together with next prime (5115561673) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3824309281 + 1291252356 = 61841^2 + 35934^2 .

It is a cyclic number.

It is not a de Polignac number, because 5115561637 - 2⁷ = 5115561509 is a prime.

It is a super-2 number, since 2×5115561637² = 52337941723892239538, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 5115561637.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5115561037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2557780818 + 2557780819.

It is an arithmetic number, because the mean of its divisors is an integer number (2557780819).

Almost surely, 2^5115561637 is an apocalyptic number.

It is an amenable number.

5115561637 is a deficient number, since it is larger than the sum of its proper divisors (1).

5115561637 is an equidigital number, since it uses as much as digits as its factorization.

5115561637 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 94500, while the sum is 40.

The square root of 5115561637 is about 71523.1545515157. The cubic root of 5115561637 is about 1723.0495787136.

The spelling of 5115561637 in words is "five billion, one hundred fifteen million, five hundred sixty-one thousand, six hundred thirty-seven".