161965533 has 8 divisors (see below), whose sum is σ = 217404000. Its totient is φ = 107252048.

The previous prime is 161965487. The next prime is 161965547. The reversal of 161965533 is 335569161.

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 161965533 - 2¹⁴ = 161949149 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161965491 and 161965500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161965033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 180723 + ... + 181616.

It is an arithmetic number, because the mean of its divisors is an integer number (27175500).

Almost surely, 2^161965533 is an apocalyptic number.

It is an amenable number.

161965533 is a deficient number, since it is larger than the sum of its proper divisors (55438467).

161965533 is a wasteful number, since it uses less digits than its factorization.

161965533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362491.

The product of its digits is 72900, while the sum is 39.

The square root of 161965533 is about 12726.5679976968. The cubic root of 161965533 is about 545.0975141844.

The spelling of 161965533 in words is "one hundred sixty-one million, nine hundred sixty-five thousand, five hundred thirty-three".