51518467861811 has 2 divisors, whose sum is σ = 51518467861812. Its totient is φ = 51518467861810.

The previous prime is 51518467861769. The next prime is 51518467861813. The reversal of 51518467861811 is 11816876481515.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51518467861811 - 2²⁶ = 51518400752947 is a prime.

It is a super-4 number, since 4×51518467861811⁴ (a number of 56 digits) contains 4444 as substring.

Together with 51518467861813, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51518467861813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25759233930905 + 25759233930906.

It is an arithmetic number, because the mean of its divisors is an integer number (25759233930906).

Almost surely, 2^{51518467861811} is an apocalyptic number.

51518467861811 is a deficient number, since it is larger than the sum of its proper divisors (1).

51518467861811 is an equidigital number, since it uses as much as digits as its factorization.

51518467861811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12902400, while the sum is 62.

The spelling of 51518467861811 in words is "fifty-one trillion, five hundred eighteen billion, four hundred sixty-seven million, eight hundred sixty-one thousand, eight hundred eleven".