161659565 has 8 divisors (see below), whose sum is σ = 194182368. Its totient is φ = 129200400.

The previous prime is 161659523. The next prime is 161659567. The reversal of 161659565 is 565956161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 161659565 - 2⁶ = 161659501 is a prime.

It is a super-2 number, since 2×161659565² = 52267629911978450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161659567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10127 + ... + 20636.

It is an arithmetic number, because the mean of its divisors is an integer number (24272796).

Almost surely, 2^161659565 is an apocalyptic number.

It is an amenable number.

161659565 is a deficient number, since it is larger than the sum of its proper divisors (32522803).

161659565 is a wasteful number, since it uses less digits than its factorization.

161659565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31819.

The product of its digits is 243000, while the sum is 44.

The square root of 161659565 is about 12714.5414781659. The cubic root of 161659565 is about 544.7540511319.

The spelling of 161659565 in words is "one hundred sixty-one million, six hundred fifty-nine thousand, five hundred sixty-five".