161665339 has 4 divisors (see below), whose sum is σ = 176362200. Its totient is φ = 146968480.

The previous prime is 161665333. The next prime is 161665373. The reversal of 161665339 is 933566161.

161665339 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 161665339 - 2⁵ = 161665307 is a prime.

It is a super-2 number, since 2×161665339² = 52271363667969842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161665333) 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, 7348414 + ... + 7348435.

It is an arithmetic number, because the mean of its divisors is an integer number (44090550).

Almost surely, 2^161665339 is an apocalyptic number.

161665339 is a deficient number, since it is larger than the sum of its proper divisors (14696861).

161665339 is a wasteful number, since it uses less digits than its factorization.

161665339 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14696860.

The product of its digits is 87480, while the sum is 40.

The square root of 161665339 is about 12714.7685389865. The cubic root of 161665339 is about 544.7605367208.

The spelling of 161665339 in words is "one hundred sixty-one million, six hundred sixty-five thousand, three hundred thirty-nine".