51800815127 has 2 divisors, whose sum is σ = 51800815128. Its totient is φ = 51800815126.

The previous prime is 51800815123. The next prime is 51800815189. The reversal of 51800815127 is 72151800815.

51800815127 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51800815127 - 2² = 51800815123 is a prime.

It is a super-2 number, since 2×51800815127² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51800815123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25900407563 + 25900407564.

It is an arithmetic number, because the mean of its divisors is an integer number (25900407564).

Almost surely, 2^51800815127 is an apocalyptic number.

51800815127 is a deficient number, since it is larger than the sum of its proper divisors (1).

51800815127 is an equidigital number, since it uses as much as digits as its factorization.

51800815127 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22400, while the sum is 38.

The spelling of 51800815127 in words is "fifty-one billion, eight hundred million, eight hundred fifteen thousand, one hundred twenty-seven".