51100070081 has 2 divisors, whose sum is σ = 51100070082. Its totient is φ = 51100070080.

The previous prime is 51100070053. The next prime is 51100070167. The reversal of 51100070081 is 18007000115.

51100070081 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 can be written as a sum of positive squares in only one way, i.e., 25877548225 + 25222521856 = 160865^2 + 158816^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51100070081 is a prime.

It is a super-2 number, since 2×51100070081² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51100079081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25550035040 + 25550035041.

It is an arithmetic number, because the mean of its divisors is an integer number (25550035041).

Almost surely, 2^51100070081 is an apocalyptic number.

It is an amenable number.

51100070081 is a deficient number, since it is larger than the sum of its proper divisors (1).

51100070081 is an equidigital number, since it uses as much as digits as its factorization.

51100070081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 280, while the sum is 23.

Adding to 51100070081 its reverse (18007000115), we get a palindrome (69107070196).

The spelling of 51100070081 in words is "fifty-one billion, one hundred million, seventy thousand, eighty-one".