6665555444 has 12 divisors (see below), whose sum is σ = 11862429600. Its totient is φ = 3276289848.

The previous prime is 6665555417. The next prime is 6665555447. The reversal of 6665555444 is 4445555666.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 6665555392 and 6665555401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6665555447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is an upside-down number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14121704 + ... + 14122175.

It is an arithmetic number, because the mean of its divisors is an integer number (988535800).

Almost surely, 2^6665555444 is an apocalyptic number.

It is an amenable number.

6665555444 is a deficient number, since it is larger than the sum of its proper divisors (5196874156).

6665555444 is a wasteful number, since it uses less digits than its factorization.

6665555444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28243942 (or 28243940 counting only the distinct ones).

The product of its digits is 8640000, while the sum is 50.

The square root of 6665555444 is about 81642.8529878764. The cubic root of 6665555444 is about 1881.9674818949.

The spelling of 6665555444 in words is "six billion, six hundred sixty-five million, five hundred fifty-five thousand, four hundred forty-four".