51318778463 has 4 divisors (see below), whose sum is σ = 51345947520. Its totient is φ = 51291609408.

The previous prime is 51318778457. The next prime is 51318778493. The reversal of 51318778463 is 36487781315.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51318778463 - 2⁸ = 51318778207 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51318778493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13581695 + ... + 13585472.

It is an arithmetic number, because the mean of its divisors is an integer number (12836486880).

Almost surely, 2^51318778463 is an apocalyptic number.

51318778463 is a deficient number, since it is larger than the sum of its proper divisors (27169057).

51318778463 is a wasteful number, since it uses less digits than its factorization.

51318778463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27169056.

The product of its digits is 3386880, while the sum is 53.

The spelling of 51318778463 in words is "fifty-one billion, three hundred eighteen million, seven hundred seventy-eight thousand, four hundred sixty-three".