51492685609 has 2 divisors, whose sum is σ = 51492685610. Its totient is φ = 51492685608.

The previous prime is 51492685583. The next prime is 51492685633. The reversal of 51492685609 is 90658629415.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26326036009 + 25166649600 = 162253^2 + 158640^2 .

It is a cyclic number.

It is not a de Polignac number, because 51492685609 - 2⁷ = 51492685481 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51492685609.

It is not a weakly prime, because it can be changed into another prime (51492685639) 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, 25746342804 + 25746342805.

It is an arithmetic number, because the mean of its divisors is an integer number (25746342805).

Almost surely, 2^51492685609 is an apocalyptic number.

It is an amenable number.

51492685609 is a deficient number, since it is larger than the sum of its proper divisors (1).

51492685609 is an equidigital number, since it uses as much as digits as its factorization.

51492685609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4665600, while the sum is 55.

The spelling of 51492685609 in words is "fifty-one billion, four hundred ninety-two million, six hundred eighty-five thousand, six hundred nine".