161326033 has 6 divisors (see below), whose sum is σ = 177325442. Its totient is φ = 146659920.

The previous prime is 161326019. The next prime is 161326051. The reversal of 161326033 is 330623161.

It can be written as a sum of positive squares in only one way, i.e., 96491329 + 64834704 = 9823^2 + 8052^2 .

It is a de Polignac number, because none of the positive numbers 2^k-161326033 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161325989 and 161326007.

It is not an unprimeable number, because it can be changed into a prime (161326003) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 666516 + ... + 666757.

Almost surely, 2^161326033 is an apocalyptic number.

It is an amenable number.

161326033 is a deficient number, since it is larger than the sum of its proper divisors (15999409).

161326033 is a wasteful number, since it uses less digits than its factorization.

161326033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1333295 (or 1333284 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 25.

The square root of 161326033 is about 12701.4185428243. The cubic root of 161326033 is about 544.3791521760.

Adding to 161326033 its reverse (330623161), we get a palindrome (491949194).

The spelling of 161326033 in words is "one hundred sixty-one million, three hundred twenty-six thousand, thirty-three".