1666171167206 has 32 divisors (see below), whose sum is σ = 3076072796160. Its totient is φ = 659130818976.

The previous prime is 1666171167187. The next prime is 1666171167209. The reversal of 1666171167206 is 6027611716661.

It is a super-2 number, since 2×1666171167206² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666171167209) 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, 16074815 + ... + 16178133.

It is an arithmetic number, because the mean of its divisors is an integer number (96127274880).

Almost surely, 2^{1666171167206} is an apocalyptic number.

1666171167206 is a deficient number, since it is larger than the sum of its proper divisors (1409901628954).

1666171167206 is a wasteful number, since it uses less digits than its factorization.

1666171167206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191948.

The product of its (nonzero) digits is 762048, while the sum is 50.

The spelling of 1666171167206 in words is "one trillion, six hundred sixty-six billion, one hundred seventy-one million, one hundred sixty-seven thousand, two hundred six".