64440555504447 has 8 divisors (see below), whose sum is σ = 88883524833840. Its totient is φ = 41478978255680.

The previous prime is 64440555504431. The next prime is 64440555504487. The reversal of 64440555504447 is 74440555504446.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64440555504447 - 2⁴ = 64440555504431 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64440555504487) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 370348020054 + ... + 370348020227.

It is an arithmetic number, because the mean of its divisors is an integer number (11110440604230).

Almost surely, 2^{64440555504447} is an apocalyptic number.

64440555504447 is a deficient number, since it is larger than the sum of its proper divisors (24442969329393).

64440555504447 is a wasteful number, since it uses less digits than its factorization.

64440555504447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 740696040313.

The product of its (nonzero) digits is 107520000, while the sum is 57.

Subtracting 64440555504447 from its reverse (74440555504446), we obtain a palindrome (9999999999999).

The spelling of 64440555504447 in words is "sixty-four trillion, four hundred forty billion, five hundred fifty-five million, five hundred four thousand, four hundred forty-seven".