1666660285293 has 16 divisors (see below), whose sum is σ = 2230241682816. Its totient is φ = 1107100037120.

The previous prime is 1666660285289. The next prime is 1666660285327. The reversal of 1666660285293 is 3925820666661.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1666660285293 - 2² = 1666660285289 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666660205293) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36013 + ... + 1826093.

It is an arithmetic number, because the mean of its divisors is an integer number (139390105176).

Almost surely, 2^{1666660285293} is an apocalyptic number.

It is an amenable number.

1666660285293 is a deficient number, since it is larger than the sum of its proper divisors (563581397523).

1666660285293 is a wasteful number, since it uses less digits than its factorization.

1666660285293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1791204.

The product of its (nonzero) digits is 33592320, while the sum is 60.

The spelling of 1666660285293 in words is "one trillion, six hundred sixty-six billion, six hundred sixty million, two hundred eighty-five thousand, two hundred ninety-three".