1666855552206 has 64 divisors (see below), whose sum is σ = 3596229439488. Its totient is φ = 512010989568.

The previous prime is 1666855552199. The next prime is 1666855552231. The reversal of 1666855552206 is 6022555586661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 119335435 + ... + 119349401.

It is an arithmetic number, because the mean of its divisors is an integer number (56191084992).

Almost surely, 2^{1666855552206} is an apocalyptic number.

1666855552206 is an abundant number, since it is smaller than the sum of its proper divisors (1929373887282).

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

1666855552206 is a wasteful number, since it uses less digits than its factorization.

1666855552206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16465.

The product of its (nonzero) digits is 25920000, while the sum is 57.

The spelling of 1666855552206 in words is "one trillion, six hundred sixty-six billion, eight hundred fifty-five million, five hundred fifty-two thousand, two hundred six".