518696827421 has 2 divisors, whose sum is σ = 518696827422. Its totient is φ = 518696827420.

The previous prime is 518696827393. The next prime is 518696827457. The reversal of 518696827421 is 124728696815.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 518644828900 + 51998521 = 720170^2 + 7211^2 .

It is a cyclic number.

It is not a de Polignac number, because 518696827421 - 2¹⁴ = 518696811037 is a prime.

It is a super-2 number, since 2×518696827421² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (518696821421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 259348413710 + 259348413711.

It is an arithmetic number, because the mean of its divisors is an integer number (259348413711).

Almost surely, 2^518696827421 is an apocalyptic number.

It is an amenable number.

518696827421 is a deficient number, since it is larger than the sum of its proper divisors (1).

518696827421 is an equidigital number, since it uses as much as digits as its factorization.

518696827421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11612160, while the sum is 59.

The spelling of 518696827421 in words is "five hundred eighteen billion, six hundred ninety-six million, eight hundred twenty-seven thousand, four hundred twenty-one".