19919314944 has 168 divisors, whose sum is σ = 58345171092. Its totient is φ = 6547046400.

The previous prime is 19919314907. The next prime is 19919314951. The reversal of 19919314944 is 44941391991.

It can be written as a sum of positive squares in 2 ways, for example, as 19914854400 + 4460544 = 141120^2 + 2112^2 .

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5380294 + ... + 5383994.

Almost surely, 2^19919314944 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19919314944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29172585546).

19919314944 is an abundant number, since it is smaller than the sum of its proper divisors (38425856148).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19919314944 is an equidigital number, since it uses as much as digits as its factorization.

19919314944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3806 (or 3779 counting only the distinct ones).

The product of its digits is 1259712, while the sum is 54.

The spelling of 19919314944 in words is "nineteen billion, nine hundred nineteen million, three hundred fourteen thousand, nine hundred forty-four".