51791465669 has 2 divisors, whose sum is σ = 51791465670. Its totient is φ = 51791465668.

The previous prime is 51791465641. The next prime is 51791465699. The reversal of 51791465669 is 96656419715.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39100316644 + 12691149025 = 197738^2 + 112655^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51791465669 is a prime.

It is a super-2 number, since 2×51791465669² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51791465699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25895732834 + 25895732835.

It is an arithmetic number, because the mean of its divisors is an integer number (25895732835).

Almost surely, 2^51791465669 is an apocalyptic number.

It is an amenable number.

51791465669 is a deficient number, since it is larger than the sum of its proper divisors (1).

51791465669 is an equidigital number, since it uses as much as digits as its factorization.

51791465669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12247200, while the sum is 59.

It can be divided in two parts, 5179146 and 5669, that added together give a palindrome (5184815).

The spelling of 51791465669 in words is "fifty-one billion, seven hundred ninety-one million, four hundred sixty-five thousand, six hundred sixty-nine".