16152221165 has 4 divisors (see below), whose sum is σ = 19382665404. Its totient is φ = 12921776928.

The previous prime is 16152221161. The next prime is 16152221177. The reversal of 16152221165 is 56112225161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56112225161 = 201791 ⋅278071.

It can be written as a sum of positive squares in 2 ways, for example, as 9077897284 + 7074323881 = 95278^2 + 84109^2 .

It is a cyclic number.

It is not a de Polignac number, because 16152221165 - 2² = 16152221161 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16152221161) 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, 1615222112 + ... + 1615222121.

It is an arithmetic number, because the mean of its divisors is an integer number (4845666351).

Almost surely, 2^16152221165 is an apocalyptic number.

It is an amenable number.

16152221165 is a deficient number, since it is larger than the sum of its proper divisors (3230444239).

16152221165 is an equidigital number, since it uses as much as digits as its factorization.

16152221165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3230444238.

The product of its digits is 7200, while the sum is 32.

The spelling of 16152221165 in words is "sixteen billion, one hundred fifty-two million, two hundred twenty-one thousand, one hundred sixty-five".