166613025381806 has 16 divisors (see below), whose sum is σ = 249970063057200. Its totient is φ = 83289671557248.

The previous prime is 166613025381799. The next prime is 166613025381823. The reversal of 166613025381806 is 608183520316661.

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, 1010986460 + ... + 1011151248.

It is an arithmetic number, because the mean of its divisors is an integer number (15623128941075).

Almost surely, 2^{166613025381806} is an apocalyptic number.

166613025381806 is a deficient number, since it is larger than the sum of its proper divisors (83357037675394).

166613025381806 is a wasteful number, since it uses less digits than its factorization.

166613025381806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263923.

The product of its (nonzero) digits is 7464960, while the sum is 56.

The spelling of 166613025381806 in words is "one hundred sixty-six trillion, six hundred thirteen billion, twenty-five million, three hundred eighty-one thousand, eight hundred six".