51978530005 has 4 divisors (see below), whose sum is σ = 62374236012. Its totient is φ = 41582824000.

The previous prime is 51978529991. The next prime is 51978530041. The reversal of 51978530005 is 50003587915.

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 39173118084 + 12805411921 = 197922^2 + 113161^2 .

It is not a de Polignac number, because 51978530005 - 2⁵ = 51978529973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 5197852996 + ... + 5197853005.

It is an arithmetic number, because the mean of its divisors is an integer number (15593559003).

Almost surely, 2^51978530005 is an apocalyptic number.

It is an amenable number.

51978530005 is a deficient number, since it is larger than the sum of its proper divisors (10395706007).

51978530005 is a wasteful number, since it uses less digits than its factorization.

51978530005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10395706006.

The product of its (nonzero) digits is 189000, while the sum is 43.

The spelling of 51978530005 in words is "fifty-one billion, nine hundred seventy-eight million, five hundred thirty thousand, five".