660111444 has 36 divisors (see below), whose sum is σ = 1730418144. Its totient is φ = 220036824.

The previous prime is 660111409. The next prime is 660111451. The reversal of 660111444 is 444111066.

660111444 is a `hidden beast` number, since 6 + 601 + 1 + 14 + 44 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 338592 + ... + 340535.

Almost surely, 2^660111444 is an apocalyptic number.

It is an amenable number.

660111444 is an abundant number, since it is smaller than the sum of its proper divisors (1070306700).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

660111444 is a wasteful number, since it uses less digits than its factorization.

660111444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 679146 (or 679132 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 660111444 is about 25692.6340416860. The cubic root of 660111444 is about 870.7077712563.

The spelling of 660111444 in words is "six hundred sixty million, one hundred eleven thousand, four hundred forty-four".