166197797 has 4 divisors (see below), whose sum is σ = 175974156. Its totient is φ = 156421440.

The previous prime is 166197761. The next prime is 166197803. The reversal of 166197797 is 797791661.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 70040161 + 96157636 = 8369^2 + 9806^2 .

It is a cyclic number.

It is not a de Polignac number, because 166197797 - 2¹⁰ = 166196773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166197497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4888154 + ... + 4888187.

It is an arithmetic number, because the mean of its divisors is an integer number (43993539).

Almost surely, 2^166197797 is an apocalyptic number.

166197797 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

166197797 is a deficient number, since it is larger than the sum of its proper divisors (9776359).

166197797 is an equidigital number, since it uses as much as digits as its factorization.

166197797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9776358.

The product of its digits is 1000188, while the sum is 53.

The square root of 166197797 is about 12891.7724537784. The cubic root of 166197797 is about 549.8046656208.

The spelling of 166197797 in words is "one hundred sixty-six million, one hundred ninety-seven thousand, seven hundred ninety-seven".