51500051011 has 4 divisors (see below), whose sum is σ = 51576574792. Its totient is φ = 51423527232.

The previous prime is 51500051003. The next prime is 51500051021. The reversal of 51500051011 is 11015000515.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11015000515 = 5 ⋅2203000103.

It is a cyclic number.

It is not a de Polignac number, because 51500051011 - 2³ = 51500051003 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51500051011.

It is not an unprimeable number, because it can be changed into a prime (51500051021) 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, 38260881 + ... + 38262226.

It is an arithmetic number, because the mean of its divisors is an integer number (12894143698).

Almost surely, 2^51500051011 is an apocalyptic number.

51500051011 is a deficient number, since it is larger than the sum of its proper divisors (76523781).

51500051011 is an equidigital number, since it uses as much as digits as its factorization.

51500051011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76523780.

The product of its (nonzero) digits is 125, while the sum is 19.

Adding to 51500051011 its reverse (11015000515), we get a palindrome (62515051526).

The spelling of 51500051011 in words is "fifty-one billion, five hundred million, fifty-one thousand, eleven".