66105155089 has 4 divisors (see below), whose sum is σ = 66126924724. Its totient is φ = 66083385456.

The previous prime is 66105155023. The next prime is 66105155131. The reversal of 66105155089 is 98055150166.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98055150166 = 2 ⋅49027575083.

It can be written as a sum of positive squares in 2 ways, for example, as 31909748689 + 34195406400 = 178633^2 + 184920^2 .

It is a cyclic number.

It is not a de Polignac number, because 66105155089 - 2³¹ = 63957671441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66105155689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10880262 + ... + 10886335.

It is an arithmetic number, because the mean of its divisors is an integer number (16531731181).

Almost surely, 2^66105155089 is an apocalyptic number.

It is an amenable number.

66105155089 is a deficient number, since it is larger than the sum of its proper divisors (21769635).

66105155089 is a wasteful number, since it uses less digits than its factorization.

66105155089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21769634.

The product of its (nonzero) digits is 324000, while the sum is 46.

The spelling of 66105155089 in words is "sixty-six billion, one hundred five million, one hundred fifty-five thousand, eighty-nine".