16365212161 has 4 divisors (see below), whose sum is σ = 16398543024. Its totient is φ = 16331881300.

The previous prime is 16365212159. The next prime is 16365212179. The reversal of 16365212161 is 16121256361.

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.

It is a cyclic number.

It is not a de Polignac number, because 16365212161 - 2¹ = 16365212159 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16365212131) 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, 16664695 + ... + 16665676.

It is an arithmetic number, because the mean of its divisors is an integer number (4099635756).

Almost surely, 2^16365212161 is an apocalyptic number.

It is an amenable number.

16365212161 is a deficient number, since it is larger than the sum of its proper divisors (33330863).

16365212161 is an equidigital number, since it uses as much as digits as its factorization.

16365212161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33330862.

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

The spelling of 16365212161 in words is "sixteen billion, three hundred sixty-five million, two hundred twelve thousand, one hundred sixty-one".