51500020051 has 2 divisors, whose sum is σ = 51500020052. Its totient is φ = 51500020050.

The previous prime is 51500020007. The next prime is 51500020109. The reversal of 51500020051 is 15002000515.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51500020051 - 2²¹ = 51497922899 is a prime.

It is not a weakly prime, because it can be changed into another prime (51500020001) by changing a digit.

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 as a sum of consecutive naturals, namely, 25750010025 + 25750010026.

It is an arithmetic number, because the mean of its divisors is an integer number (25750010026).

Almost surely, 2^51500020051 is an apocalyptic number.

51500020051 is a deficient number, since it is larger than the sum of its proper divisors (1).

51500020051 is an equidigital number, since it uses as much as digits as its factorization.

51500020051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 250, while the sum is 19.

Adding to 51500020051 its reverse (15002000515), we get a palindrome (66502020566).

The spelling of 51500020051 in words is "fifty-one billion, five hundred million, twenty thousand, fifty-one".