51654247693 has 2 divisors, whose sum is σ = 51654247694. Its totient is φ = 51654247692.

The previous prime is 51654247621. The next prime is 51654247717. The reversal of 51654247693 is 39674245615.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51464552164 + 189695529 = 226858^2 + 13773^2 .

It is a cyclic number.

It is not a de Polignac number, because 51654247693 - 2⁹ = 51654247181 is a prime.

It is a super-2 number, since 2×51654247693² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51654247693.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51654247093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25827123846 + 25827123847.

It is an arithmetic number, because the mean of its divisors is an integer number (25827123847).

Almost surely, 2^51654247693 is an apocalyptic number.

It is an amenable number.

51654247693 is a deficient number, since it is larger than the sum of its proper divisors (1).

51654247693 is an equidigital number, since it uses as much as digits as its factorization.

51654247693 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5443200, while the sum is 52.

The spelling of 51654247693 in words is "fifty-one billion, six hundred fifty-four million, two hundred forty-seven thousand, six hundred ninety-three".