19965799228 has 24 divisors (see below), whose sum is σ = 35176798944. Its totient is φ = 9915379200.

The previous prime is 19965799213. The next prime is 19965799253. The reversal of 19965799228 is 82299756991.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 898168 + ... + 920128.

It is an arithmetic number, because the mean of its divisors is an integer number (1465699956).

Almost surely, 2^19965799228 is an apocalyptic number.

It is an amenable number.

19965799228 is a deficient number, since it is larger than the sum of its proper divisors (15210999716).

19965799228 is a wasteful number, since it uses less digits than its factorization.

19965799228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23493 (or 23491 counting only the distinct ones).

The product of its digits is 44089920, while the sum is 67.

The spelling of 19965799228 in words is "nineteen billion, nine hundred sixty-five million, seven hundred ninety-nine thousand, two hundred twenty-eight".