65881089 has 6 divisors (see below), whose sum is σ = 95161586. Its totient is φ = 43920720.

The previous prime is 65881051. The next prime is 65881097. The reversal of 65881089 is 98018856.

It can be written as a sum of positive squares in only one way, i.e., 49112064 + 16769025 = 7008^2 + 4095^2 .

It is not a de Polignac number, because 65881089 - 2¹⁷ = 65750017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (65881009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3660052 + ... + 3660069.

Almost surely, 2^65881089 is an apocalyptic number.

It is an amenable number.

65881089 is a deficient number, since it is larger than the sum of its proper divisors (29280497).

65881089 is a wasteful number, since it uses less digits than its factorization.

65881089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7320127 (or 7320124 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 45.

The square root of 65881089 is about 8116.7166391343. The cubic root of 65881089 is about 403.8811552039.

The spelling of 65881089 in words is "sixty-five million, eight hundred eighty-one thousand, eighty-nine".