65881618809 has 8 divisors (see below), whose sum is σ = 87851463360. Its totient is φ = 43916426736.

The previous prime is 65881618771. The next prime is 65881618867. The reversal of 65881618809 is 90881618856.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 65881618809 - 2¹¹ = 65881616761 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65881618109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1129942 + ... + 1186815.

It is an arithmetic number, because the mean of its divisors is an integer number (10981432920).

Almost surely, 2^65881618809 is an apocalyptic number.

It is an amenable number.

65881618809 is a deficient number, since it is larger than the sum of its proper divisors (21969844551).

65881618809 is a wasteful number, since it uses less digits than its factorization.

65881618809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2326239.

The product of its (nonzero) digits is 6635520, while the sum is 60.

The spelling of 65881618809 in words is "sixty-five billion, eight hundred eighty-one million, six hundred eighteen thousand, eight hundred nine".