166083259391 has 4 divisors (see below), whose sum is σ = 189809439312. Its totient is φ = 142357079472.

The previous prime is 166083259379. The next prime is 166083259409. The reversal of 166083259391 is 193952380661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 193952380661 = 13 ⋅14919413897.

It is a cyclic number.

It is not a de Polignac number, because 166083259391 - 2⁶ = 166083259327 is a prime.

It is a super-3 number, since 3×166083259391³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166083259351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11863089950 + ... + 11863089963.

It is an arithmetic number, because the mean of its divisors is an integer number (47452359828).

Almost surely, 2^166083259391 is an apocalyptic number.

166083259391 is a deficient number, since it is larger than the sum of its proper divisors (23726179921).

166083259391 is an equidigital number, since it uses as much as digits as its factorization.

166083259391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23726179920.

The product of its (nonzero) digits is 2099520, while the sum is 53.

The spelling of 166083259391 in words is "one hundred sixty-six billion, eighty-three million, two hundred fifty-nine thousand, three hundred ninety-one".