1666665606536 has 32 divisors (see below), whose sum is σ = 3577703040000. Its totient is φ = 713029911936.

The previous prime is 1666665606511. The next prime is 1666665606589. The reversal of 1666665606536 is 6356065666661.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26120936 + ... + 26184663.

It is an arithmetic number, because the mean of its divisors is an integer number (111803220000).

Almost surely, 2^{1666665606536} is an apocalyptic number.

It is an amenable number.

1666665606536 is an abundant number, since it is smaller than the sum of its proper divisors (1911037433464).

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

1666665606536 is a wasteful number, since it uses less digits than its factorization.

1666665606536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52306181 (or 52306177 counting only the distinct ones).

The product of its (nonzero) digits is 125971200, while the sum is 62.

The spelling of 1666665606536 in words is "one trillion, six hundred sixty-six billion, six hundred sixty-five million, six hundred six thousand, five hundred thirty-six".