166541406 has 8 divisors (see below), whose sum is σ = 333082824. Its totient is φ = 55513800.

The previous prime is 166541399. The next prime is 166541429. The reversal of 166541406 is 604145661.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

166541406 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13878445 + ... + 13878456.

It is an arithmetic number, because the mean of its divisors is an integer number (41635353).

Almost surely, 2^166541406 is an apocalyptic number.

166541406 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

166541406 is a wasteful number, since it uses less digits than its factorization.

166541406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27756906.

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 166541406 is about 12905.0922507358. The cubic root of 166541406 is about 550.1833063932.

It can be divided in two parts, 1665 and 41406, that added together give a triangular number (43071 = T₂₉₃).

The spelling of 166541406 in words is "one hundred sixty-six million, five hundred forty-one thousand, four hundred six".