511668735481 has 2 divisors, whose sum is σ = 511668735482. Its totient is φ = 511668735480.

The previous prime is 511668735467. The next prime is 511668735499. The reversal of 511668735481 is 184537866115.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 490735275625 + 20933459856 = 700525^2 + 144684^2 .

It is a cyclic number.

It is not a de Polignac number, because 511668735481 - 2¹³ = 511668727289 is a prime.

It is a super-2 number, since 2×511668735481² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (511668735881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255834367740 + 255834367741.

It is an arithmetic number, because the mean of its divisors is an integer number (255834367741).

Almost surely, 2^511668735481 is an apocalyptic number.

It is an amenable number.

511668735481 is a deficient number, since it is larger than the sum of its proper divisors (1).

511668735481 is an equidigital number, since it uses as much as digits as its factorization.

511668735481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4838400, while the sum is 55.

The spelling of 511668735481 in words is "five hundred eleven billion, six hundred sixty-eight million, seven hundred thirty-five thousand, four hundred eighty-one".