161406565 has 8 divisors (see below), whose sum is σ = 193766040. Its totient is φ = 129073152.

The previous prime is 161406529. The next prime is 161406587. The reversal of 161406565 is 565604161.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 471969 + 160934596 = 687^2 + 12686^2 .

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 161406565 - 2¹⁷ = 161275493 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161406565.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11797 + ... + 21493.

It is an arithmetic number, because the mean of its divisors is an integer number (24220755).

Almost surely, 2^161406565 is an apocalyptic number.

It is an amenable number.

161406565 is a deficient number, since it is larger than the sum of its proper divisors (32359475).

161406565 is an equidigital number, since it uses as much as digits as its factorization.

161406565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13031.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 161406565 is about 12704.5883443739. The cubic root of 161406565 is about 544.4697195988.

The spelling of 161406565 in words is "one hundred sixty-one million, four hundred six thousand, five hundred sixty-five".