161780333 has 8 divisors (see below), whose sum is σ = 190063776. Its totient is φ = 135759600.

The previous prime is 161780309. The next prime is 161780341. The reversal of 161780333 is 333087161.

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 161780333 - 2¹⁴ = 161763949 is a prime.

It is a super-2 number, since 2×161780333² = 52345752291181778, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161780333.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161780303) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 565523 + ... + 565808.

It is an arithmetic number, because the mean of its divisors is an integer number (23757972).

Almost surely, 2^161780333 is an apocalyptic number.

161780333 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

161780333 is a deficient number, since it is larger than the sum of its proper divisors (28283443).

161780333 is a wasteful number, since it uses less digits than its factorization.

161780333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1131355.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 161780333 is about 12719.2897993559. The cubic root of 161780333 is about 544.8896704532.

The spelling of 161780333 in words is "one hundred sixty-one million, seven hundred eighty thousand, three hundred thirty-three".