64644026226021 has 24 divisors (see below), whose sum is σ = 102852278283456. Its totient is φ = 38797826855040.

The previous prime is 64644026225959. The next prime is 64644026226053. The reversal of 64644026226021 is 12062262044646.

64644026226021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-64644026226021 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64644026226061) 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 in 23 ways as a sum of consecutive naturals, for example, 3169746900 + ... + 3169767293.

It is an arithmetic number, because the mean of its divisors is an integer number (4285511595144).

Almost surely, 2^{64644026226021} is an apocalyptic number.

It is an amenable number.

64644026226021 is a deficient number, since it is larger than the sum of its proper divisors (38208252057435).

64644026226021 is a wasteful number, since it uses less digits than its factorization.

64644026226021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6339514313 (or 6339514310 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 45.

The spelling of 64644026226021 in words is "sixty-four trillion, six hundred forty-four billion, twenty-six million, two hundred twenty-six thousand, twenty-one".