16197296641 has 4 divisors (see below), whose sum is σ = 16248392532. Its totient is φ = 16146200752.

The previous prime is 16197296639. The next prime is 16197296657. The reversal of 16197296641 is 14669279161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14669279161 = 43 ⋅341146027.

It can be written as a sum of positive squares in 2 ways, for example, as 532271041 + 15665025600 = 23071^2 + 125160^2 .

It is a cyclic number.

It is not a de Polignac number, because 16197296641 - 2¹ = 16197296639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16197296611) 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, 25547470 + ... + 25548103.

It is an arithmetic number, because the mean of its divisors is an integer number (4062098133).

Almost surely, 2^16197296641 is an apocalyptic number.

It is an amenable number.

16197296641 is a deficient number, since it is larger than the sum of its proper divisors (51095891).

16197296641 is an equidigital number, since it uses as much as digits as its factorization.

16197296641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51095890.

The product of its digits is 979776, while the sum is 52.

The spelling of 16197296641 in words is "sixteen billion, one hundred ninety-seven million, two hundred ninety-six thousand, six hundred forty-one".