51704056421513 has 2 divisors, whose sum is σ = 51704056421514. Its totient is φ = 51704056421512.

The previous prime is 51704056421491. The next prime is 51704056421551. The reversal of 51704056421513 is 31512465040715.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27400063533049 + 24303992888464 = 5234507^2 + 4929908^2 .

It is a cyclic number.

It is not a de Polignac number, because 51704056421513 - 2¹⁴ = 51704056405129 is a prime.

It is a super-2 number, since 2×51704056421513² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51704056421813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25852028210756 + 25852028210757.

It is an arithmetic number, because the mean of its divisors is an integer number (25852028210757).

Almost surely, 2^{51704056421513} is an apocalyptic number.

It is an amenable number.

51704056421513 is a deficient number, since it is larger than the sum of its proper divisors (1).

51704056421513 is an equidigital number, since it uses as much as digits as its factorization.

51704056421513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504000, while the sum is 44.

The spelling of 51704056421513 in words is "fifty-one trillion, seven hundred four billion, fifty-six million, four hundred twenty-one thousand, five hundred thirteen".