16223765161 has 4 divisors (see below), whose sum is σ = 16224096592. Its totient is φ = 16223433732.

The previous prime is 16223765147. The next prime is 16223765203. The reversal of 16223765161 is 16156732261.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16156732261 = 121577 ⋅132893.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16223765161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16223765861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76155 + ... + 195568.

It is an arithmetic number, because the mean of its divisors is an integer number (4056024148).

Almost surely, 2^16223765161 is an apocalyptic number.

It is an amenable number.

16223765161 is a deficient number, since it is larger than the sum of its proper divisors (331431).

16223765161 is an equidigital number, since it uses as much as digits as its factorization.

16223765161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331430.

The product of its digits is 90720, while the sum is 40.

The spelling of 16223765161 in words is "sixteen billion, two hundred twenty-three million, seven hundred sixty-five thousand, one hundred sixty-one".