1665556060666 has 16 divisors (see below), whose sum is σ = 2537009741448. Its totient is φ = 819977256000.

The previous prime is 1665556060639. The next prime is 1665556060667. The reversal of 1665556060666 is 6660606555661.

It can be written as a sum of positive squares in 4 ways, for example, as 1315826939025 + 349729121641 = 1147095^2 + 591379^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1665556060666.

It is not an unprimeable number, because it can be changed into a prime (1665556060667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22740585 + ... + 22813708.

Almost surely, 2^{1665556060666} is an apocalyptic number.

1665556060666 is a deficient number, since it is larger than the sum of its proper divisors (871453680782).

1665556060666 is a wasteful number, since it uses less digits than its factorization.

1665556060666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45554577.

The product of its (nonzero) digits is 34992000, while the sum is 58.

The spelling of 1665556060666 in words is "one trillion, six hundred sixty-five billion, five hundred fifty-six million, sixty thousand, six hundred sixty-six".