5218576615981 has 8 divisors (see below), whose sum is σ = 5230300318200. Its totient is φ = 5206853363712.

The previous prime is 5218576615961. The next prime is 5218576616023. The reversal of 5218576615981 is 1895166758125.

It can be written as a sum of positive squares in 4 ways, for example, as 1599036120900 + 3619540495081 = 1264530^2 + 1902509^2 .

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 5218576615981 - 2⁵ = 5218576615949 is a prime.

It is a super-2 number, since 2×5218576615981² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5218576615951) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36276111 + ... + 36419683.

It is an arithmetic number, because the mean of its divisors is an integer number (653787539775).

Almost surely, 2^{5218576615981} is an apocalyptic number.

It is an amenable number.

5218576615981 is a deficient number, since it is larger than the sum of its proper divisors (11723702219).

5218576615981 is a wasteful number, since it uses less digits than its factorization.

5218576615981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224975.

The product of its digits is 36288000, while the sum is 64.

The spelling of 5218576615981 in words is "five trillion, two hundred eighteen billion, five hundred seventy-six million, six hundred fifteen thousand, nine hundred eighty-one".