51418578178523 has 2 divisors, whose sum is σ = 51418578178524. Its totient is φ = 51418578178522.

The previous prime is 51418578178519. The next prime is 51418578178529. The reversal of 51418578178523 is 32587187581415.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51418578178523 - 2² = 51418578178519 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51418578178523.

It is not a weakly prime, because it can be changed into another prime (51418578178529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25709289089261 + 25709289089262.

It is an arithmetic number, because the mean of its divisors is an integer number (25709289089262).

Almost surely, 2^{51418578178523} is an apocalyptic number.

51418578178523 is a deficient number, since it is larger than the sum of its proper divisors (1).

51418578178523 is an equidigital number, since it uses as much as digits as its factorization.

51418578178523 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75264000, while the sum is 65.

The spelling of 51418578178523 in words is "fifty-one trillion, four hundred eighteen billion, five hundred seventy-eight million, one hundred seventy-eight thousand, five hundred twenty-three".