51868448477 has 2 divisors, whose sum is σ = 51868448478. Its totient is φ = 51868448476.

The previous prime is 51868448453. The next prime is 51868448491. The reversal of 51868448477 is 77484486815.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34273487161 + 17594961316 = 185131^2 + 132646^2 .

It is a cyclic number.

It is not a de Polignac number, because 51868448477 - 2⁸ = 51868448221 is a prime.

It is a super-2 number, since 2×51868448477² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51868448497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25934224238 + 25934224239.

It is an arithmetic number, because the mean of its divisors is an integer number (25934224239).

Almost surely, 2^51868448477 is an apocalyptic number.

It is an amenable number.

51868448477 is a deficient number, since it is larger than the sum of its proper divisors (1).

51868448477 is an equidigital number, since it uses as much as digits as its factorization.

51868448477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48168960, while the sum is 62.

The spelling of 51868448477 in words is "fifty-one billion, eight hundred sixty-eight million, four hundred forty-eight thousand, four hundred seventy-seven".