51005000005 has 16 divisors (see below), whose sum is σ = 61446886704. Its totient is φ = 40643665920.

The previous prime is 51004999993. The next prime is 51005000009. The reversal of 51005000005 is 50000050015.

It can be written as a sum of positive squares in 8 ways, for example, as 2699114209 + 48305885796 = 51953^2 + 219786^2 .

It is a de Polignac number, because none of the positive numbers 2^k-51005000005 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 (51005000009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1638385 + ... + 1669225.

It is an arithmetic number, because the mean of its divisors is an integer number (3840430419).

Almost surely, 2^51005000005 is an apocalyptic number.

It is an amenable number.

51005000005 is a deficient number, since it is larger than the sum of its proper divisors (10441886699).

51005000005 is a wasteful number, since it uses less digits than its factorization.

51005000005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32136.

The product of its (nonzero) digits is 125, while the sum is 16.

The spelling of 51005000005 in words is "fifty-one billion, five million, five", and thus it is an aban number and an uban number.