166855208406 has 16 divisors (see below), whose sum is σ = 351274123200. Its totient is φ = 52691118408.

The previous prime is 166855208381. The next prime is 166855208413. The reversal of 166855208406 is 604802558661.

It is a congruent number.

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, 731820976 + ... + 731821203.

It is an arithmetic number, because the mean of its divisors is an integer number (21954632700).

Almost surely, 2^166855208406 is an apocalyptic number.

166855208406 is an abundant number, since it is smaller than the sum of its proper divisors (184418914794).

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

166855208406 is a wasteful number, since it uses less digits than its factorization.

166855208406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1463642203.

The product of its (nonzero) digits is 2764800, while the sum is 51.

The spelling of 166855208406 in words is "one hundred sixty-six billion, eight hundred fifty-five million, two hundred eight thousand, four hundred six".