161626165 has 8 divisors (see below), whose sum is σ = 194192568. Its totient is φ = 129140160.

The previous prime is 161626151. The next prime is 161626189. The reversal of 161626165 is 561626161.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 41460721 + 120165444 = 6439^2 + 10962^2 .

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

It is not a de Polignac number, because 161626165 - 2⁵ = 161626133 is a prime.

It is a super-2 number, since 2×161626165² = 52246034425214450, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161626165.

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, 15582 + ... + 23791.

It is an arithmetic number, because the mean of its divisors is an integer number (24274071).

Almost surely, 2^161626165 is an apocalyptic number.

It is an amenable number.

161626165 is a deficient number, since it is larger than the sum of its proper divisors (32566403).

161626165 is an equidigital number, since it uses as much as digits as its factorization.

161626165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40199.

The product of its digits is 12960, while the sum is 34.

The square root of 161626165 is about 12713.2279535923. The cubic root of 161626165 is about 544.7165318786.

The spelling of 161626165 in words is "one hundred sixty-one million, six hundred twenty-six thousand, one hundred sixty-five".