161335565235321 has 16 divisors (see below), whose sum is σ = 217706364583680. Its totient is φ = 106260911136720.

The previous prime is 161335565235253. The next prime is 161335565235349. The reversal of 161335565235321 is 123532565533161.

It is a happy number.

It is not a de Polignac number, because 161335565235321 - 2¹⁰ = 161335565234297 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (161335565235421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 190114170 + ... + 190960908.

It is an arithmetic number, because the mean of its divisors is an integer number (13606647786480).

Almost surely, 2^{161335565235321} is an apocalyptic number.

It is an amenable number.

161335565235321 is a deficient number, since it is larger than the sum of its proper divisors (56370799348359).

161335565235321 is an equidigital number, since it uses as much as digits as its factorization.

161335565235321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1612036.

The product of its digits is 7290000, while the sum is 51.

The spelling of 161335565235321 in words is "one hundred sixty-one trillion, three hundred thirty-five billion, five hundred sixty-five million, two hundred thirty-five thousand, three hundred twenty-one".