51878782793 has 4 divisors (see below), whose sum is σ = 51900573828. Its totient is φ = 51856991760.

The previous prime is 51878782757. The next prime is 51878782811. The reversal of 51878782793 is 39728787815.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8253359104 + 43625423689 = 90848^2 + 208867^2 .

It is a cyclic number.

It is not a de Polignac number, because 51878782793 - 2¹² = 51878778697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51878782093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10891946 + ... + 10896707.

It is an arithmetic number, because the mean of its divisors is an integer number (12975143457).

Almost surely, 2^51878782793 is an apocalyptic number.

It is an amenable number.

51878782793 is a deficient number, since it is larger than the sum of its proper divisors (21791035).

51878782793 is a wasteful number, since it uses less digits than its factorization.

51878782793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21791034.

The product of its digits is 47416320, while the sum is 65.

The spelling of 51878782793 in words is "fifty-one billion, eight hundred seventy-eight million, seven hundred eighty-two thousand, seven hundred ninety-three".