64416794228581 has 2 divisors, whose sum is σ = 64416794228582. Its totient is φ = 64416794228580.

The previous prime is 64416794228569. The next prime is 64416794228599. The reversal of 64416794228581 is 18582249761446.

64416794228581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47208359855556 + 17208434373025 = 6870834^2 + 4148305^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64416794228581 is a prime.

It is a super-2 number, since 2×64416794228581² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64416794228561) 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, 32208397114290 + 32208397114291.

It is an arithmetic number, because the mean of its divisors is an integer number (32208397114291).

Almost surely, 2^{64416794228581} is an apocalyptic number.

It is an amenable number.

64416794228581 is a deficient number, since it is larger than the sum of its proper divisors (1).

64416794228581 is an equidigital number, since it uses as much as digits as its factorization.

64416794228581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 185794560, while the sum is 67.

The spelling of 64416794228581 in words is "sixty-four trillion, four hundred sixteen billion, seven hundred ninety-four million, two hundred twenty-eight thousand, five hundred eighty-one".