51550500515081 has 2 divisors, whose sum is σ = 51550500515082. Its totient is φ = 51550500515080.

The previous prime is 51550500515077. The next prime is 51550500515149. The reversal of 51550500515081 is 18051500505515.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49546690401481 + 2003810113600 = 7038941^2 + 1415560^2 .

It is a cyclic number.

It is not a de Polignac number, because 51550500515081 - 2² = 51550500515077 is a prime.

It is a super-2 number, since 2×51550500515081² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51550500515881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25775250257540 + 25775250257541.

It is an arithmetic number, because the mean of its divisors is an integer number (25775250257541).

Almost surely, 2^{51550500515081} is an apocalyptic number.

It is an amenable number.

51550500515081 is a deficient number, since it is larger than the sum of its proper divisors (1).

51550500515081 is an equidigital number, since it uses as much as digits as its factorization.

51550500515081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 125000, while the sum is 41.

The spelling of 51550500515081 in words is "fifty-one trillion, five hundred fifty billion, five hundred million, five hundred fifteen thousand, eighty-one".