66225494585 has 4 divisors (see below), whose sum is σ = 79470593508. Its totient is φ = 52980395664.

The previous prime is 66225494557. The next prime is 66225494591. The reversal of 66225494585 is 58549452266.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58549452266 = 2 ⋅29274726133.

It can be written as a sum of positive squares in 2 ways, for example, as 14392321024 + 51833173561 = 119968^2 + 227669^2 .

It is a cyclic number.

It is not a de Polignac number, because 66225494585 - 2²⁰ = 66224446009 is a prime.

It is a super-2 number, since 2×66225494585² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66225494585.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6622549454 + ... + 6622549463.

It is an arithmetic number, because the mean of its divisors is an integer number (19867648377).

Almost surely, 2^66225494585 is an apocalyptic number.

It is an amenable number.

66225494585 is a deficient number, since it is larger than the sum of its proper divisors (13245098923).

66225494585 is a wasteful number, since it uses less digits than its factorization.

66225494585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13245098922.

The product of its digits is 20736000, while the sum is 56.

The spelling of 66225494585 in words is "sixty-six billion, two hundred twenty-five million, four hundred ninety-four thousand, five hundred eighty-five".