51667711481 has 2 divisors, whose sum is σ = 51667711482. Its totient is φ = 51667711480.

The previous prime is 51667711477. The next prime is 51667711483. The reversal of 51667711481 is 18411776615.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46703099881 + 4964611600 = 216109^2 + 70460^2 .

It is a cyclic number.

It is not a de Polignac number, because 51667711481 - 2² = 51667711477 is a prime.

It is a super-2 number, since 2×51667711481² (a number of 22 digits) contains 22 as substring.

Together with 51667711483, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51667711483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25833855740 + 25833855741.

It is an arithmetic number, because the mean of its divisors is an integer number (25833855741).

Almost surely, 2^51667711481 is an apocalyptic number.

It is an amenable number.

51667711481 is a deficient number, since it is larger than the sum of its proper divisors (1).

51667711481 is an equidigital number, since it uses as much as digits as its factorization.

51667711481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 282240, while the sum is 47.

The spelling of 51667711481 in words is "fifty-one billion, six hundred sixty-seven million, seven hundred eleven thousand, four hundred eighty-one".