66566558473 has 2 divisors, whose sum is σ = 66566558474. Its totient is φ = 66566558472.

The previous prime is 66566558467. The next prime is 66566558479. The reversal of 66566558473 is 37485566566.

It is a balanced prime because it is at equal distance from previous prime (66566558467) and next prime (66566558479).

It can be written as a sum of positive squares in only one way, i.e., 57258746944 + 9307811529 = 239288^2 + 96477^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66566558473 is a prime.

It is a super-2 number, since 2×66566558473² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66566558479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33283279236 + 33283279237.

It is an arithmetic number, because the mean of its divisors is an integer number (33283279237).

Almost surely, 2^66566558473 is an apocalyptic number.

It is an amenable number.

66566558473 is a deficient number, since it is larger than the sum of its proper divisors (1).

66566558473 is an equidigital number, since it uses as much as digits as its factorization.

66566558473 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864000, while the sum is 61.

The spelling of 66566558473 in words is "sixty-six billion, five hundred sixty-six million, five hundred fifty-eight thousand, four hundred seventy-three".