19964426138 has 8 divisors (see below), whose sum is σ = 30012169332. Its totient is φ = 9960369696.

The previous prime is 19964426129. The next prime is 19964426179. The reversal of 19964426138 is 83162446991.

It can be written as a sum of positive squares in 2 ways, for example, as 18073306969 + 1891119169 = 134437^2 + 43487^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×19964426138² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 19964426138.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10920545 + ... + 10922372.

Almost surely, 2^19964426138 is an apocalyptic number.

19964426138 is a deficient number, since it is larger than the sum of its proper divisors (10047743194).

19964426138 is a wasteful number, since it uses less digits than its factorization.

19964426138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21843376.

The product of its digits is 2239488, while the sum is 53.

The spelling of 19964426138 in words is "nineteen billion, nine hundred sixty-four million, four hundred twenty-six thousand, one hundred thirty-eight".