51418578178691 has 2 divisors, whose sum is σ = 51418578178692. Its totient is φ = 51418578178690.

The previous prime is 51418578178663. The next prime is 51418578178697. The reversal of 51418578178691 is 19687187581415.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51418578178691 - 2³⁴ = 51401398309507 is a prime.

It is not a weakly prime, because it can be changed into another prime (51418578178697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25709289089345 + 25709289089346.

It is an arithmetic number, because the mean of its divisors is an integer number (25709289089346).

Almost surely, 2^{51418578178691} is an apocalyptic number.

51418578178691 is a deficient number, since it is larger than the sum of its proper divisors (1).

51418578178691 is an equidigital number, since it uses as much as digits as its factorization.

51418578178691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 135475200, while the sum is 71.

The spelling of 51418578178691 in words is "fifty-one trillion, four hundred eighteen billion, five hundred seventy-eight million, one hundred seventy-eight thousand, six hundred ninety-one".