19709679226 has 4 divisors (see below), whose sum is σ = 29564518842. Its totient is φ = 9854839612.

The previous prime is 19709679139. The next prime is 19709679247. The reversal of 19709679226 is 62297690791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 62297690791 = 7 ⋅8899670113.

It can be written as a sum of positive squares in only one way, i.e., 12149550625 + 7560128601 = 110225^2 + 86949^2 .

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4927419805 + ... + 4927419808.

Almost surely, 2^19709679226 is an apocalyptic number.

19709679226 is a deficient number, since it is larger than the sum of its proper divisors (9854839616).

19709679226 is an equidigital number, since it uses as much as digits as its factorization.

19709679226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9854839615.

The product of its (nonzero) digits is 5143824, while the sum is 58.

The spelling of 19709679226 in words is "nineteen billion, seven hundred nine million, six hundred seventy-nine thousand, two hundred twenty-six".