51340882881805 has 48 divisors (see below), whose sum is σ = 68488608711600. Its totient is φ = 36915991833600.

The previous prime is 51340882881803. The next prime is 51340882881817. The reversal of 51340882881805 is 50818828804315.

It can be written as a sum of positive squares in 8 ways, for example, as 5298863309476 + 46042019572329 = 2301926^2 + 6785427^2 .

It is not a de Polignac number, because 51340882881805 - 2¹ = 51340882881803 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51340882881803) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 29556241 + ... + 31245049.

It is an arithmetic number, because the mean of its divisors is an integer number (1426846014825).

Almost surely, 2^{51340882881805} is an apocalyptic number.

51340882881805 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51340882881805 is a deficient number, since it is larger than the sum of its proper divisors (17147725829795).

51340882881805 is a wasteful number, since it uses less digits than its factorization.

51340882881805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1689406 (or 1689395 counting only the distinct ones).

The product of its (nonzero) digits is 19660800, while the sum is 61.

The spelling of 51340882881805 in words is "fifty-one trillion, three hundred forty billion, eight hundred eighty-two million, eight hundred eighty-one thousand, eight hundred five".