1666665015012 has 36 divisors (see below), whose sum is σ = 4254671260476. Its totient is φ = 550054459200.

The previous prime is 1666665014999. The next prime is 1666665015047. The reversal of 1666665015012 is 2105105666661.

It can be written as a sum of positive squares in 2 ways, for example, as 1302556559616 + 364108455396 = 1141296^2 + 603414^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 229185723 + ... + 229192994.

It is an arithmetic number, because the mean of its divisors is an integer number (118185312791).

Almost surely, 2^{1666665015012} is an apocalyptic number.

1666665015012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1666665015012 is an abundant number, since it is smaller than the sum of its proper divisors (2588006245464).

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

1666665015012 is a wasteful number, since it uses less digits than its factorization.

1666665015012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458378828 (or 458378823 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 45.

The spelling of 1666665015012 in words is "one trillion, six hundred sixty-six billion, six hundred sixty-five million, fifteen thousand, twelve".