51666054463 has 2 divisors, whose sum is σ = 51666054464. Its totient is φ = 51666054462.

The previous prime is 51666054457. The next prime is 51666054481. The reversal of 51666054463 is 36445066615.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51666054463 - 2¹⁷ = 51665923391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51666054403) 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, 25833027231 + 25833027232.

It is an arithmetic number, because the mean of its divisors is an integer number (25833027232).

Almost surely, 2^51666054463 is an apocalyptic number.

51666054463 is a deficient number, since it is larger than the sum of its proper divisors (1).

51666054463 is an equidigital number, since it uses as much as digits as its factorization.

51666054463 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1555200, while the sum is 46.

The spelling of 51666054463 in words is "fifty-one billion, six hundred sixty-six million, fifty-four thousand, four hundred sixty-three".