161326805 has 8 divisors (see below), whose sum is σ = 194780832. Its totient is φ = 128269008.

The previous prime is 161326757. The next prime is 161326817. The reversal of 161326805 is 508623161.

It is a happy number.

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 161326805 - 2¹⁸ = 161064661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98159 + ... + 99788.

It is an arithmetic number, because the mean of its divisors is an integer number (24347604).

Almost surely, 2^161326805 is an apocalyptic number.

It is an amenable number.

161326805 is a deficient number, since it is larger than the sum of its proper divisors (33454027).

161326805 is a wasteful number, since it uses less digits than its factorization.

161326805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198115.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 161326805 is about 12701.4489330942. The cubic root of 161326805 is about 544.3800205212.

Adding to 161326805 its reverse (508623161), we get a palindrome (669949966).

The spelling of 161326805 in words is "one hundred sixty-one million, three hundred twenty-six thousand, eight hundred five".