51382974815 has 4 divisors (see below), whose sum is σ = 61659569784. Its totient is φ = 41106379848.

The previous prime is 51382974787. The next prime is 51382974817. The reversal of 51382974815 is 51847928315.

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 51382974815 - 2¹⁰ = 51382973791 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 (51382974817) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5138297477 + ... + 5138297486.

It is an arithmetic number, because the mean of its divisors is an integer number (15414892446).

Almost surely, 2^51382974815 is an apocalyptic number.

51382974815 is a deficient number, since it is larger than the sum of its proper divisors (10276594969).

51382974815 is a wasteful number, since it uses less digits than its factorization.

51382974815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10276594968.

The product of its digits is 2419200, while the sum is 53.

The spelling of 51382974815 in words is "fifty-one billion, three hundred eighty-two million, nine hundred seventy-four thousand, eight hundred fifteen".