1665611207120 has 40 divisors (see below), whose sum is σ = 4425766923264. Its totient is φ = 571066699392.

The previous prime is 1665611207111. The next prime is 1665611207153. The reversal of 1665611207120 is 217021165661.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1487152304 + ... + 1487153423.

Almost surely, 2^{1665611207120} is an apocalyptic number.

1665611207120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1665611207120 is an abundant number, since it is smaller than the sum of its proper divisors (2760155716144).

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

1665611207120 is a wasteful number, since it uses less digits than its factorization.

1665611207120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2974305747 (or 2974305741 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 38.

The spelling of 1665611207120 in words is "one trillion, six hundred sixty-five billion, six hundred eleven million, two hundred seven thousand, one hundred twenty".