64642446040643 has 2 divisors, whose sum is σ = 64642446040644. Its totient is φ = 64642446040642.

The previous prime is 64642446040637. The next prime is 64642446040729. The reversal of 64642446040643 is 34604064424646.

64642446040643 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 is a cyclic number.

It is not a de Polignac number, because 64642446040643 - 2¹⁴ = 64642446024259 is a prime.

It is not a weakly prime, because it can be changed into another prime (64642446040633) 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, 32321223020321 + 32321223020322.

It is an arithmetic number, because the mean of its divisors is an integer number (32321223020322).

Almost surely, 2^{64642446040643} is an apocalyptic number.

64642446040643 is a deficient number, since it is larger than the sum of its proper divisors (1).

64642446040643 is an equidigital number, since it uses as much as digits as its factorization.

64642446040643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31850496, while the sum is 53.

The spelling of 64642446040643 in words is "sixty-four trillion, six hundred forty-two billion, four hundred forty-six million, forty thousand, six hundred forty-three".