51418578178559 has 2 divisors, whose sum is σ = 51418578178560. Its totient is φ = 51418578178558.

The previous prime is 51418578178543. The next prime is 51418578178663. The reversal of 51418578178559 is 95587187581415.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51418578178559 - 2⁴ = 51418578178543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51418578178519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25709289089279 + 25709289089280.

It is an arithmetic number, because the mean of its divisors is an integer number (25709289089280).

Almost surely, 2^{51418578178559} is an apocalyptic number.

51418578178559 is a deficient number, since it is larger than the sum of its proper divisors (1).

51418578178559 is an equidigital number, since it uses as much as digits as its factorization.

51418578178559 is an evil number, because the sum of its binary digits is even.

The product of its digits is 564480000, while the sum is 74.

The spelling of 51418578178559 in words is "fifty-one trillion, four hundred eighteen billion, five hundred seventy-eight million, one hundred seventy-eight thousand, five hundred fifty-nine".