19851773632 has 56 divisors (see below), whose sum is σ = 40280234400. Its totient is φ = 9704386560.

The previous prime is 19851773621. The next prime is 19851773671. The reversal of 19851773632 is 23637715891.

It is a self number, because there is not a number n which added to its sum of digits gives 19851773632.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 636744 + ... + 667192.

It is an arithmetic number, because the mean of its divisors is an integer number (719289900).

Almost surely, 2^19851773632 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 19851773632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20140117200).

19851773632 is an abundant number, since it is smaller than the sum of its proper divisors (20428460768).

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

19851773632 is a wasteful number, since it uses less digits than its factorization.

19851773632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30689 (or 30679 counting only the distinct ones).

The product of its digits is 1905120, while the sum is 52.

The spelling of 19851773632 in words is "nineteen billion, eight hundred fifty-one million, seven hundred seventy-three thousand, six hundred thirty-two".