66566552473 has 2 divisors, whose sum is σ = 66566552474. Its totient is φ = 66566552472.

The previous prime is 66566552449. The next prime is 66566552501. The reversal of 66566552473 is 37425566566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40744633609 + 25821918864 = 201853^2 + 160692^2 .

It is a cyclic number.

It is not a de Polignac number, because 66566552473 - 2²⁹ = 66029681561 is a prime.

It is a super-2 number, since 2×66566552473² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66566558473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33283276236 + 33283276237.

It is an arithmetic number, because the mean of its divisors is an integer number (33283276237).

Almost surely, 2^66566552473 is an apocalyptic number.

It is an amenable number.

66566552473 is a deficient number, since it is larger than the sum of its proper divisors (1).

66566552473 is an equidigital number, since it uses as much as digits as its factorization.

66566552473 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216000, while the sum is 55.

The spelling of 66566552473 in words is "sixty-six billion, five hundred sixty-six million, five hundred fifty-two thousand, four hundred seventy-three".