19698144229 has 4 divisors (see below), whose sum is σ = 19698459084. Its totient is φ = 19697829376.

The previous prime is 19698144187. The next prime is 19698144233. The reversal of 19698144229 is 92244189691.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 92244189691 = 61 ⋅1512199831.

It can be written as a sum of positive squares in 2 ways, for example, as 98704225 + 19599440004 = 9935^2 + 139998^2 .

It is a cyclic number.

It is not a de Polignac number, because 19698144229 - 2¹¹ = 19698142181 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19698144229.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19698144269) 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, 28252 + ... + 200485.

It is an arithmetic number, because the mean of its divisors is an integer number (4924614771).

Almost surely, 2^19698144229 is an apocalyptic number.

It is an amenable number.

19698144229 is a deficient number, since it is larger than the sum of its proper divisors (314855).

19698144229 is an equidigital number, since it uses as much as digits as its factorization.

19698144229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314854.

The product of its digits is 2239488, while the sum is 55.

The spelling of 19698144229 in words is "nineteen billion, six hundred ninety-eight million, one hundred forty-four thousand, two hundred twenty-nine".