64644440626459 has 2 divisors, whose sum is σ = 64644440626460. Its totient is φ = 64644440626458.

The previous prime is 64644440626457. The next prime is 64644440626463. The reversal of 64644440626459 is 95462604444646.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64644440626459 - 2¹ = 64644440626457 is a prime.

Together with 64644440626457, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 64644440626459.

It is not a weakly prime, because it can be changed into another prime (64644440626457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32322220313229 + 32322220313230.

It is an arithmetic number, because the mean of its divisors is an integer number (32322220313230).

Almost surely, 2^{64644440626459} is an apocalyptic number.

64644440626459 is a deficient number, since it is larger than the sum of its proper divisors (1).

64644440626459 is an equidigital number, since it uses as much as digits as its factorization.

64644440626459 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 477757440, while the sum is 64.

The spelling of 64644440626459 in words is "sixty-four trillion, six hundred forty-four billion, four hundred forty million, six hundred twenty-six thousand, four hundred fifty-nine".