65811194546838 has 32 divisors (see below), whose sum is σ = 142371625245696. Its totient is φ = 20160393037728.

The previous prime is 65811194546803. The next prime is 65811194546879. The reversal of 65811194546838 is 83864549111856.

It is a super-2 number, since 2×65811194546838² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1858425606 + ... + 1858461017.

It is an arithmetic number, because the mean of its divisors is an integer number (4449113288928).

Almost surely, 2^{65811194546838} is an apocalyptic number.

65811194546838 is an abundant number, since it is smaller than the sum of its proper divisors (76560430698858).

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

65811194546838 is a wasteful number, since it uses less digits than its factorization.

65811194546838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3716886868.

The product of its digits is 199065600, while the sum is 69.

The spelling of 65811194546838 in words is "sixty-five trillion, eight hundred eleven billion, one hundred ninety-four million, five hundred forty-six thousand, eight hundred thirty-eight".