161856333 has 8 divisors (see below), whose sum is σ = 239787200. Its totient is φ = 107904204.

The previous prime is 161856319. The next prime is 161856347. The reversal of 161856333 is 333658161.

It is a happy number.

161856333 is a `hidden beast` number, since 1 + 6 + 18 + 5 + 633 + 3 = 666.

It is an interprime number because it is at equal distance from previous prime (161856319) and next prime (161856347).

It is not a de Polignac number, because 161856333 - 2¹⁸ = 161594189 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 (161856353) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2997313 + ... + 2997366.

It is an arithmetic number, because the mean of its divisors is an integer number (29973400).

Almost surely, 2^161856333 is an apocalyptic number.

It is an amenable number.

161856333 is a deficient number, since it is larger than the sum of its proper divisors (77930867).

161856333 is an equidigital number, since it uses as much as digits as its factorization.

161856333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5994688 (or 5994682 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 161856333 is about 12722.2770367572. The cubic root of 161856333 is about 544.9749818777.

The spelling of 161856333 in words is "one hundred sixty-one million, eight hundred fifty-six thousand, three hundred thirty-three".