65844521111 has 2 divisors, whose sum is σ = 65844521112. Its totient is φ = 65844521110.

The previous prime is 65844521107. The next prime is 65844521123. The reversal of 65844521111 is 11112544856.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65844521111 - 2² = 65844521107 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65844521131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32922260555 + 32922260556.

It is an arithmetic number, because the mean of its divisors is an integer number (32922260556).

Almost surely, 2^65844521111 is an apocalyptic number.

65844521111 is a deficient number, since it is larger than the sum of its proper divisors (1).

65844521111 is an equidigital number, since it uses as much as digits as its factorization.

65844521111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38400, while the sum is 38.

The spelling of 65844521111 in words is "sixty-five billion, eight hundred forty-four million, five hundred twenty-one thousand, one hundred eleven".