51566655653 has 2 divisors, whose sum is σ = 51566655654. Its totient is φ = 51566655652.

The previous prime is 51566655641. The next prime is 51566655703. The reversal of 51566655653 is 35655666515.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50777214244 + 789441409 = 225338^2 + 28097^2 .

It is a cyclic number.

It is not a de Polignac number, because 51566655653 - 2⁶ = 51566655589 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51566655595 and 51566655604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51566655053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25783327826 + 25783327827.

It is an arithmetic number, because the mean of its divisors is an integer number (25783327827).

Almost surely, 2^51566655653 is an apocalyptic number.

It is an amenable number.

51566655653 is a deficient number, since it is larger than the sum of its proper divisors (1).

51566655653 is an equidigital number, since it uses as much as digits as its factorization.

51566655653 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12150000, while the sum is 53.

The spelling of 51566655653 in words is "fifty-one billion, five hundred sixty-six million, six hundred fifty-five thousand, six hundred fifty-three".