51540457518773 has 2 divisors, whose sum is σ = 51540457518774. Its totient is φ = 51540457518772.

The previous prime is 51540457518749. The next prime is 51540457518829. The reversal of 51540457518773 is 37781575404515.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44930503932484 + 6609953586289 = 6703022^2 + 2570983^2 .

It is a cyclic number.

It is not a de Polignac number, because 51540457518773 - 2²⁰ = 51540456470197 is a prime.

It is a super-2 number, since 2×51540457518773² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51540477518773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25770228759386 + 25770228759387.

It is an arithmetic number, because the mean of its divisors is an integer number (25770228759387).

Almost surely, 2^{51540457518773} is an apocalyptic number.

It is an amenable number.

51540457518773 is a deficient number, since it is larger than the sum of its proper divisors (1).

51540457518773 is an equidigital number, since it uses as much as digits as its factorization.

51540457518773 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 82320000, while the sum is 62.

The spelling of 51540457518773 in words is "fifty-one trillion, five hundred forty billion, four hundred fifty-seven million, five hundred eighteen thousand, seven hundred seventy-three".