166194144939 has 16 divisors (see below), whose sum is σ = 232423331328. Its totient is φ = 105507952992.

The previous prime is 166194144937. The next prime is 166194144953. The reversal of 166194144939 is 939441491661.

It is not a de Polignac number, because 166194144939 - 2¹ = 166194144937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166194144937) 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, 15922917 + ... + 15933350.

It is an arithmetic number, because the mean of its divisors is an integer number (14526458208).

Almost surely, 2^166194144939 is an apocalyptic number.

166194144939 is a deficient number, since it is larger than the sum of its proper divisors (66229186389).

166194144939 is a wasteful number, since it uses less digits than its factorization.

166194144939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31856354.

The product of its digits is 5038848, while the sum is 57.

The spelling of 166194144939 in words is "one hundred sixty-six billion, one hundred ninety-four million, one hundred forty-four thousand, nine hundred thirty-nine".