65811043 has 4 divisors (see below), whose sum is σ = 66045528. Its totient is φ = 65576560.

The previous prime is 65811037. The next prime is 65811089. The reversal of 65811043 is 34011856.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65811043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65818043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116821 + ... + 117382.

It is an arithmetic number, because the mean of its divisors is an integer number (16511382).

Almost surely, 2^65811043 is an apocalyptic number.

65811043 is a deficient number, since it is larger than the sum of its proper divisors (234485).

65811043 is a wasteful number, since it uses less digits than its factorization.

65811043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234484.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 65811043 is about 8112.4005694985. The cubic root of 65811043 is about 403.7379664579.

Adding to 65811043 its reverse (34011856), we get a palindrome (99822899).

The spelling of 65811043 in words is "sixty-five million, eight hundred eleven thousand, forty-three".