19681049750 has 16 divisors (see below), whose sum is σ = 36842925600. Its totient is φ = 7872419800.

The previous prime is 19681049747. The next prime is 19681049761. The reversal of 19681049750 is 5794018691.

It is a Harshad number since it is a multiple of its sum of digits (50).

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 7 ways as a sum of consecutive naturals, for example, 39361850 + ... + 39362349.

It is an arithmetic number, because the mean of its divisors is an integer number (2302682850).

Almost surely, 2^19681049750 is an apocalyptic number.

19681049750 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19681049750 is a deficient number, since it is larger than the sum of its proper divisors (17161875850).

19681049750 is an equidigital number, since it uses as much as digits as its factorization.

19681049750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78724216 (or 78724206 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 50.

The spelling of 19681049750 in words is "nineteen billion, six hundred eighty-one million, forty-nine thousand, seven hundred fifty".