51384323569 has 2 divisors, whose sum is σ = 51384323570. Its totient is φ = 51384323568.

The previous prime is 51384323563. The next prime is 51384323591. The reversal of 51384323569 is 96532348315.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51356624400 + 27699169 = 226620^2 + 5263^2 .

It is a cyclic number.

It is not a de Polignac number, because 51384323569 - 2²¹ = 51382226417 is a prime.

It is a super-2 number, since 2×51384323569² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51384323563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25692161784 + 25692161785.

It is an arithmetic number, because the mean of its divisors is an integer number (25692161785).

Almost surely, 2^51384323569 is an apocalyptic number.

It is an amenable number.

51384323569 is a deficient number, since it is larger than the sum of its proper divisors (1).

51384323569 is an equidigital number, since it uses as much as digits as its factorization.

51384323569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2332800, while the sum is 49.

The spelling of 51384323569 in words is "fifty-one billion, three hundred eighty-four million, three hundred twenty-three thousand, five hundred sixty-nine".