51530211723869 has 2 divisors, whose sum is σ = 51530211723870. Its totient is φ = 51530211723868.

The previous prime is 51530211723829. The next prime is 51530211723871. The reversal of 51530211723869 is 96832711203515.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38794984587844 + 12735227136025 = 6228562^2 + 3568645^2 .

It is a cyclic number.

It is not a de Polignac number, because 51530211723869 - 2¹² = 51530211719773 is a prime.

It is a super-2 number, since 2×51530211723869² (a number of 28 digits) contains 22 as substring.

Together with 51530211723871, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51530211723869.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51530211723829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25765105861934 + 25765105861935.

It is an arithmetic number, because the mean of its divisors is an integer number (25765105861935).

Almost surely, 2^{51530211723869} is an apocalyptic number.

It is an amenable number.

51530211723869 is a deficient number, since it is larger than the sum of its proper divisors (1).

51530211723869 is an equidigital number, since it uses as much as digits as its factorization.

51530211723869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2721600, while the sum is 53.

The spelling of 51530211723869 in words is "fifty-one trillion, five hundred thirty billion, two hundred eleven million, seven hundred twenty-three thousand, eight hundred sixty-nine".