65811813 has 8 divisors (see below), whose sum is σ = 87816288. Its totient is φ = 43840944.

The previous prime is 65811803. The next prime is 65811821. The reversal of 65811813 is 31811856.

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

It is not a de Polignac number, because 65811813 - 2⁶ = 65811749 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65811803) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3406 + ... + 11967.

It is an arithmetic number, because the mean of its divisors is an integer number (10977036).

Almost surely, 2^65811813 is an apocalyptic number.

It is an amenable number.

65811813 is a deficient number, since it is larger than the sum of its proper divisors (22004475).

65811813 is a wasteful number, since it uses less digits than its factorization.

65811813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16803.

The product of its digits is 5760, while the sum is 33.

The square root of 65811813 is about 8112.4480275685. The cubic root of 65811813 is about 403.7395410519.

The spelling of 65811813 in words is "sixty-five million, eight hundred eleven thousand, eight hundred thirteen".