166193671489 has 4 divisors (see below), whose sum is σ = 166195956400. Its totient is φ = 166191386580.

The previous prime is 166193671477. The next prime is 166193671537. The reversal of 166193671489 is 984176391661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 166193671489 - 2⁹ = 166193670977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166193671459) 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, 1029639 + ... + 1180060.

It is an arithmetic number, because the mean of its divisors is an integer number (41548989100).

Almost surely, 2^166193671489 is an apocalyptic number.

It is an amenable number.

166193671489 is a deficient number, since it is larger than the sum of its proper divisors (2284911).

166193671489 is an equidigital number, since it uses as much as digits as its factorization.

166193671489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2284910.

The product of its digits is 11757312, while the sum is 61.

The spelling of 166193671489 in words is "one hundred sixty-six billion, one hundred ninety-three million, six hundred seventy-one thousand, four hundred eighty-nine".