161664933 has 4 divisors (see below), whose sum is σ = 215553248. Its totient is φ = 107776620.

The previous prime is 161664931. The next prime is 161664949. The reversal of 161664933 is 339466161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 161664933 - 2¹ = 161664931 is a prime.

It is a super-2 number, since 2×161664933² = 52271101123788978, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161664891 and 161664900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161664931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26944153 + ... + 26944158.

It is an arithmetic number, because the mean of its divisors is an integer number (53888312).

Almost surely, 2^161664933 is an apocalyptic number.

It is an amenable number.

161664933 is a deficient number, since it is larger than the sum of its proper divisors (53888315).

161664933 is an equidigital number, since it uses as much as digits as its factorization.

161664933 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53888314.

The product of its digits is 69984, while the sum is 39.

The square root of 161664933 is about 12714.7525732906. The cubic root of 161664933 is about 544.7600806903.

The spelling of 161664933 in words is "one hundred sixty-one million, six hundred sixty-four thousand, nine hundred thirty-three".