64440555504487 has 2 divisors, whose sum is σ = 64440555504488. Its totient is φ = 64440555504486.

The previous prime is 64440555504431. The next prime is 64440555504541. The reversal of 64440555504487 is 78440555504446.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64440555504487 - 2¹¹ = 64440555502439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64440555508487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32220277752243 + 32220277752244.

It is an arithmetic number, because the mean of its divisors is an integer number (32220277752244).

Almost surely, 2^{64440555504487} is an apocalyptic number.

64440555504487 is a deficient number, since it is larger than the sum of its proper divisors (1).

64440555504487 is an equidigital number, since it uses as much as digits as its factorization.

64440555504487 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 215040000, while the sum is 61.

The spelling of 64440555504487 in words is "sixty-four trillion, four hundred forty billion, five hundred fifty-five million, five hundred four thousand, four hundred eighty-seven".