5218018681 has 2 divisors, whose sum is σ = 5218018682. Its totient is φ = 5218018680.

The previous prime is 5218018661. The next prime is 5218018703. The reversal of 5218018681 is 1868108125.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5132289600 + 85729081 = 71640^2 + 9259^2 .

It is a cyclic number.

It is not a de Polignac number, because 5218018681 - 2¹¹ = 5218016633 is a prime.

It is a super-2 number, since 2×5218018681² = 54455437910529959522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (5218018661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2609009340 + 2609009341.

It is an arithmetic number, because the mean of its divisors is an integer number (2609009341).

Almost surely, 2^5218018681 is an apocalyptic number.

It is an amenable number.

5218018681 is a deficient number, since it is larger than the sum of its proper divisors (1).

5218018681 is an equidigital number, since it uses as much as digits as its factorization.

5218018681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30720, while the sum is 40.

The square root of 5218018681 is about 72235.8545391414. The cubic root of 5218018681 is about 1734.4769917398.

The spelling of 5218018681 in words is "five billion, two hundred eighteen million, eighteen thousand, six hundred eighty-one".