5156818081 has 8 divisors (see below), whose sum is σ = 5240113704. Its totient is φ = 5074137600.

The previous prime is 5156818049. The next prime is 5156818087. The reversal of 5156818081 is 1808186515.

It can be written as a sum of positive squares in 4 ways, for example, as 2032567056 + 3124251025 = 45084^2 + 55895^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 5156818081 - 2⁵ = 5156818049 is a prime.

It is a super-2 number, since 2×5156818081² = 53185545441057045122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5156818087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 136870 + ... + 170431.

It is an arithmetic number, because the mean of its divisors is an integer number (655014213).

Almost surely, 2^5156818081 is an apocalyptic number.

It is an amenable number.

5156818081 is a deficient number, since it is larger than the sum of its proper divisors (83295623).

5156818081 is a wasteful number, since it uses less digits than its factorization.

5156818081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307571.

The product of its (nonzero) digits is 76800, while the sum is 43.

The square root of 5156818081 is about 71810.9885811357. The cubic root of 5156818081 is about 1727.6692505085.

The spelling of 5156818081 in words is "five billion, one hundred fifty-six million, eight hundred eighteen thousand, eighty-one".