166683881617 has 16 divisors (see below), whose sum is σ = 187902503424. Its totient is φ = 146486592000.

The previous prime is 166683881599. The next prime is 166683881669. The reversal of 166683881617 is 716188386661.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 166683881617 - 2¹⁹ = 166683357329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166683881317) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61153 + ... + 580609.

It is an arithmetic number, because the mean of its divisors is an integer number (11743906464).

Almost surely, 2^166683881617 is an apocalyptic number.

It is an amenable number.

166683881617 is a deficient number, since it is larger than the sum of its proper divisors (21218621807).

166683881617 is a wasteful number, since it uses less digits than its factorization.

166683881617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520440.

The product of its digits is 13934592, while the sum is 61.

The spelling of 166683881617 in words is "one hundred sixty-six billion, six hundred eighty-three million, eight hundred eighty-one thousand, six hundred seventeen".