53659637561 has 2 divisors, whose sum is σ = 53659637562. Its totient is φ = 53659637560.

The previous prime is 53659637467. The next prime is 53659637579. The reversal of 53659637561 is 16573695635.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50137927225 + 3521710336 = 223915^2 + 59344^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-53659637561 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 53659637497 and 53659637506.

It is not a weakly prime, because it can be changed into another prime (53659637761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26829818780 + 26829818781.

It is an arithmetic number, because the mean of its divisors is an integer number (26829818781).

Almost surely, 2^53659637561 is an apocalyptic number.

It is an amenable number.

53659637561 is a deficient number, since it is larger than the sum of its proper divisors (1).

53659637561 is an equidigital number, since it uses as much as digits as its factorization.

53659637561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15309000, while the sum is 56.

The spelling of 53659637561 in words is "fifty-three billion, six hundred fifty-nine million, six hundred thirty-seven thousand, five hundred sixty-one".