64808992121 has 2 divisors, whose sum is σ = 64808992122. Its totient is φ = 64808992120.

The previous prime is 64808992111. The next prime is 64808992151. The reversal of 64808992121 is 12129980846.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63139125625 + 1669866496 = 251275^2 + 40864^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64808992121 is a prime.

It is a super-3 number, since 3×64808992121³ (a number of 33 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 64808992121.

It is not a weakly prime, because it can be changed into another prime (64808992111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32404496060 + 32404496061.

It is an arithmetic number, because the mean of its divisors is an integer number (32404496061).

Almost surely, 2^64808992121 is an apocalyptic number.

It is an amenable number.

64808992121 is a deficient number, since it is larger than the sum of its proper divisors (1).

64808992121 is an equidigital number, since it uses as much as digits as its factorization.

64808992121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 497664, while the sum is 50.

The spelling of 64808992121 in words is "sixty-four billion, eight hundred eight million, nine hundred ninety-two thousand, one hundred twenty-one".