6440455555 has 8 divisors (see below), whose sum is σ = 8135312400. Its totient is φ = 4881187296.

The previous prime is 6440455547. The next prime is 6440455657. The reversal of 6440455555 is 5555540446.

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 6440455555 - 2³ = 6440455547 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33897040 + ... + 33897229.

It is an arithmetic number, because the mean of its divisors is an integer number (1016914050).

Almost surely, 2^6440455555 is an apocalyptic number.

6440455555 is a deficient number, since it is larger than the sum of its proper divisors (1694856845).

6440455555 is a wasteful number, since it uses less digits than its factorization.

6440455555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67794293.

The product of its (nonzero) digits is 1200000, while the sum is 43.

The square root of 6440455555 is about 80252.4489034447. The cubic root of 6440455555 is about 1860.5393621186.

The spelling of 6440455555 in words is "six billion, four hundred forty million, four hundred fifty-five thousand, five hundred fifty-five".