19633749436 has 96 divisors (see below), whose sum is σ = 41796608000. Its totient is φ = 8057387520.

The previous prime is 19633749419. The next prime is 19633749469. The reversal of 19633749436 is 63494733691.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4123225 + ... + 4127983.

Almost surely, 2^19633749436 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 19633749436, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20898304000).

19633749436 is an abundant number, since it is smaller than the sum of its proper divisors (22162858564).

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

19633749436 is a wasteful number, since it uses less digits than its factorization.

19633749436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4912 (or 4896 counting only the distinct ones).

The product of its digits is 8817984, while the sum is 55.

The spelling of 19633749436 in words is "nineteen billion, six hundred thirty-three million, seven hundred forty-nine thousand, four hundred thirty-six".