51520412005 has 4 divisors (see below), whose sum is σ = 61824494412. Its totient is φ = 41216329600.

The previous prime is 51520411997. The next prime is 51520412011. The reversal of 51520412005 is 50021402515.

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 29183913889 + 22336498116 = 170833^2 + 149454^2 .

It is not a de Polignac number, because 51520412005 - 2³ = 51520411997 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 (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5152041196 + ... + 5152041205.

It is an arithmetic number, because the mean of its divisors is an integer number (15456123603).

Almost surely, 2^51520412005 is an apocalyptic number.

It is an amenable number.

51520412005 is a deficient number, since it is larger than the sum of its proper divisors (10304082407).

51520412005 is a wasteful number, since it uses less digits than its factorization.

51520412005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10304082406.

The product of its (nonzero) digits is 2000, while the sum is 25.

The spelling of 51520412005 in words is "fifty-one billion, five hundred twenty million, four hundred twelve thousand, five".