168772133 has 4 divisors (see below), whose sum is σ = 173333580. Its totient is φ = 164210688.

The previous prime is 168772103. The next prime is 168772139. The reversal of 168772133 is 331277861.

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 86452804 + 82319329 = 9298^2 + 9073^2 .

It is a cyclic number.

It is not a de Polignac number, because 168772133 - 2²⁴ = 151994917 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 (168772139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2280668 + ... + 2280741.

It is an arithmetic number, because the mean of its divisors is an integer number (43333395).

Almost surely, 2^168772133 is an apocalyptic number.

It is an amenable number.

168772133 is a deficient number, since it is larger than the sum of its proper divisors (4561447).

168772133 is an equidigital number, since it uses as much as digits as its factorization.

168772133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4561446.

The product of its digits is 42336, while the sum is 38.

The square root of 168772133 is about 12991.2329284021. The cubic root of 168772133 is about 552.6288833456.

The spelling of 168772133 in words is "one hundred sixty-eight million, seven hundred seventy-two thousand, one hundred thirty-three".