65811144 has 32 divisors (see below), whose sum is σ = 188032320. Its totient is φ = 18803136.

The previous prime is 65811127. The next prime is 65811167. The reversal of 65811144 is 44111856.

65811144 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×65811144² = 8662213349177472, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 195699 + ... + 196034.

It is an arithmetic number, because the mean of its divisors is an integer number (5876010).

Almost surely, 2^65811144 is an apocalyptic number.

It is an amenable number.

65811144 is an abundant number, since it is smaller than the sum of its proper divisors (122221176).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65811144 is a wasteful number, since it uses less digits than its factorization.

65811144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391749 (or 391745 counting only the distinct ones).

The product of its digits is 3840, while the sum is 30.

The square root of 65811144 is about 8112.4067945339. The cubic root of 65811144 is about 403.7381729962.

The spelling of 65811144 in words is "sixty-five million, eight hundred eleven thousand, one hundred forty-four".