66536863573 has 2 divisors, whose sum is σ = 66536863574. Its totient is φ = 66536863572.

The previous prime is 66536863537. The next prime is 66536863579. The reversal of 66536863573 is 37536863566.

Together with previous prime (66536863537) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62349091204 + 4187772369 = 249698^2 + 64713^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66536863573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66536863579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33268431786 + 33268431787.

It is an arithmetic number, because the mean of its divisors is an integer number (33268431787).

Almost surely, 2^66536863573 is an apocalyptic number.

It is an amenable number.

66536863573 is a deficient number, since it is larger than the sum of its proper divisors (1).

66536863573 is an equidigital number, since it uses as much as digits as its factorization.

66536863573 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48988800, while the sum is 58.

The spelling of 66536863573 in words is "sixty-six billion, five hundred thirty-six million, eight hundred sixty-three thousand, five hundred seventy-three".