166191779347 has 8 divisors (see below), whose sum is σ = 182684094912. Its totient is φ = 149930125800.

The previous prime is 166191779333. The next prime is 166191779399. The reversal of 166191779347 is 743977191661.

It is a happy number.

166191779347 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 166191779347 - 2²⁷ = 166057561619 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166191779317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57663993 + ... + 57666874.

It is an arithmetic number, because the mean of its divisors is an integer number (22835511864).

Almost surely, 2^166191779347 is an apocalyptic number.

166191779347 is a deficient number, since it is larger than the sum of its proper divisors (16492315565).

166191779347 is a wasteful number, since it uses less digits than its factorization.

166191779347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115331009.

The product of its digits is 12002256, while the sum is 61.

The spelling of 166191779347 in words is "one hundred sixty-six billion, one hundred ninety-one million, seven hundred seventy-nine thousand, three hundred forty-seven".