999444555666111 has 32 divisors (see below), whose sum is σ = 1393634443104000. Its totient is φ = 636462967668480.

The previous prime is 999444555666031. The next prime is 999444555666119. The reversal of 999444555666111 is 111666555444999.

It is not a de Polignac number, because 999444555666111 - 2⁹ = 999444555665599 is a prime.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999444555666119) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 95285761 + ... + 105253338.

It is an arithmetic number, because the mean of its divisors is an integer number (43551076347000).

Almost surely, 2^{999444555666111} is an apocalyptic number.

999444555666111 is a deficient number, since it is larger than the sum of its proper divisors (394189887437889).

999444555666111 is a wasteful number, since it uses less digits than its factorization.

999444555666111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200539959.

The product of its digits is 1259712000, while the sum is 75.

The spelling of 999444555666111 in words is "nine hundred ninety-nine trillion, four hundred forty-four billion, five hundred fifty-five million, six hundred sixty-six thousand, one hundred eleven".