161733885 has 8 divisors (see below), whose sum is σ = 258774240. Its totient is φ = 86258064.

The previous prime is 161733881. The next prime is 161733893. The reversal of 161733885 is 588337161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 161733885 - 2² = 161733881 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161733881) 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, 5391115 + ... + 5391144.

It is an arithmetic number, because the mean of its divisors is an integer number (32346780).

Almost surely, 2^161733885 is an apocalyptic number.

161733885 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161733885 is a deficient number, since it is larger than the sum of its proper divisors (97040355).

161733885 is a wasteful number, since it uses less digits than its factorization.

161733885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10782267.

The product of its digits is 120960, while the sum is 42.

The square root of 161733885 is about 12717.4637801725. The cubic root of 161733885 is about 544.8375185477.

The spelling of 161733885 in words is "one hundred sixty-one million, seven hundred thirty-three thousand, eight hundred eighty-five".