191957166 has 48 divisors (see below), whose sum is σ = 444804048. Its totient is φ = 59616000.

The previous prime is 191957153. The next prime is 191957201. The reversal of 191957166 is 661759191.

191957166 is a `hidden beast` number, since 1 + 9 + 19 + 571 + 66 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27801 + ... + 34011.

It is an arithmetic number, because the mean of its divisors is an integer number (9266751).

Almost surely, 2^191957166 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 191957166, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (222402024).

191957166 is an abundant number, since it is smaller than the sum of its proper divisors (252846882).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

191957166 is a wasteful number, since it uses less digits than its factorization.

191957166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6337 (or 6334 counting only the distinct ones).

The product of its digits is 102060, while the sum is 45.

The square root of 191957166 is about 13854.8607354964. The cubic root of 191957166 is about 576.8569240169.

The spelling of 191957166 in words is "one hundred ninety-one million, nine hundred fifty-seven thousand, one hundred sixty-six".