51378438434657 has 2 divisors, whose sum is σ = 51378438434658. Its totient is φ = 51378438434656.

The previous prime is 51378438434641. The next prime is 51378438434717. The reversal of 51378438434657 is 75643483487315.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47418979188736 + 3959459245921 = 6886144^2 + 1989839^2 .

It is a cyclic number.

It is not a de Polignac number, because 51378438434657 - 2⁴ = 51378438434641 is a prime.

It is a super-3 number, since 3×51378438434657³ (a number of 42 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (51378438431657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25689219217328 + 25689219217329.

It is an arithmetic number, because the mean of its divisors is an integer number (25689219217329).

Almost surely, 2^{51378438434657} is an apocalyptic number.

It is an amenable number.

51378438434657 is a deficient number, since it is larger than the sum of its proper divisors (1).

51378438434657 is an equidigital number, since it uses as much as digits as its factorization.

51378438434657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 812851200, while the sum is 68.

The spelling of 51378438434657 in words is "fifty-one trillion, three hundred seventy-eight billion, four hundred thirty-eight million, four hundred thirty-four thousand, six hundred fifty-seven".