65899855 has 12 divisors (see below), whose sum is σ = 91991160. Its totient is φ = 45188304.

The previous prime is 65899817. The next prime is 65899879. The reversal of 65899855 is 55899856.

It is not a de Polignac number, because 65899855 - 2⁹ = 65899343 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 65899796 and 65899805.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 134245 + ... + 134734.

It is an arithmetic number, because the mean of its divisors is an integer number (7665930).

Almost surely, 2^65899855 is an apocalyptic number.

65899855 is a deficient number, since it is larger than the sum of its proper divisors (26091305).

65899855 is a wasteful number, since it uses less digits than its factorization.

65899855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268998 (or 268991 counting only the distinct ones).

The product of its digits is 3888000, while the sum is 55.

The square root of 65899855 is about 8117.8725661346. The cubic root of 65899855 is about 403.9194996127.

Subtracting from 65899855 its reverse (55899856), we obtain a palindrome (9999999).

The spelling of 65899855 in words is "sixty-five million, eight hundred ninety-nine thousand, eight hundred fifty-five".