51128758787 has 2 divisors, whose sum is σ = 51128758788. Its totient is φ = 51128758786.

The previous prime is 51128758727. The next prime is 51128758873. The reversal of 51128758787 is 78785782115.

51128758787 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51128758787 - 2¹⁰ = 51128757763 is a prime.

It is a super-2 number, since 2×51128758787² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51128758717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25564379393 + 25564379394.

It is an arithmetic number, because the mean of its divisors is an integer number (25564379394).

Almost surely, 2^51128758787 is an apocalyptic number.

51128758787 is a deficient number, since it is larger than the sum of its proper divisors (1).

51128758787 is an equidigital number, since it uses as much as digits as its factorization.

51128758787 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8780800, while the sum is 59.

The spelling of 51128758787 in words is "fifty-one billion, one hundred twenty-eight million, seven hundred fifty-eight thousand, seven hundred eighty-seven".