166699406 has 4 divisors (see below), whose sum is σ = 250049112. Its totient is φ = 83349702.

The previous prime is 166699387. The next prime is 166699411. The reversal of 166699406 is 604996661.

166699406 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41674850 + ... + 41674853.

It is an arithmetic number, because the mean of its divisors is an integer number (62512278).

Almost surely, 2^166699406 is an apocalyptic number.

166699406 is a deficient number, since it is larger than the sum of its proper divisors (83349706).

166699406 is an equidigital number, since it uses as much as digits as its factorization.

166699406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83349705.

The product of its (nonzero) digits is 419904, while the sum is 47.

The square root of 166699406 is about 12911.2124140222. The cubic root of 166699406 is about 550.3572400888.

The spelling of 166699406 in words is "one hundred sixty-six million, six hundred ninety-nine thousand, four hundred six".