64670288635021 has 2 divisors, whose sum is σ = 64670288635022. Its totient is φ = 64670288635020.

The previous prime is 64670288635019. The next prime is 64670288635079. The reversal of 64670288635021 is 12053688207646.

64670288635021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (64670288635079) can be obtained adding 64670288635021 to its sum of digits (58).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55929248559396 + 8741040075625 = 7478586^2 + 2956525^2 .

It is a cyclic number.

It is not a de Polignac number, because 64670288635021 - 2¹ = 64670288635019 is a prime.

Together with 64670288635019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64670288675021) 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, 32335144317510 + 32335144317511.

It is an arithmetic number, because the mean of its divisors is an integer number (32335144317511).

Almost surely, 2^{64670288635021} is an apocalyptic number.

It is an amenable number.

64670288635021 is a deficient number, since it is larger than the sum of its proper divisors (1).

64670288635021 is an equidigital number, since it uses as much as digits as its factorization.

64670288635021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23224320, while the sum is 58.

The spelling of 64670288635021 in words is "sixty-four trillion, six hundred seventy billion, two hundred eighty-eight million, six hundred thirty-five thousand, twenty-one".