51551115569 has 2 divisors, whose sum is σ = 51551115570. Its totient is φ = 51551115568.

The previous prime is 51551115547. The next prime is 51551115599. The reversal of 51551115569 is 96551115515.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50743419169 + 807696400 = 225263^2 + 28420^2 .

It is a cyclic number.

It is not a de Polignac number, because 51551115569 - 2⁸ = 51551115313 is a prime.

It is a super-2 number, since 2×51551115569² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51551115529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25775557784 + 25775557785.

It is an arithmetic number, because the mean of its divisors is an integer number (25775557785).

Almost surely, 2^51551115569 is an apocalyptic number.

It is an amenable number.

51551115569 is a deficient number, since it is larger than the sum of its proper divisors (1).

51551115569 is an equidigital number, since it uses as much as digits as its factorization.

51551115569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 168750, while the sum is 44.

The spelling of 51551115569 in words is "fifty-one billion, five hundred fifty-one million, one hundred fifteen thousand, five hundred sixty-nine".