19809659650 has 96 divisors (see below), whose sum is σ = 42016060800. Its totient is φ = 6878361600.

The previous prime is 19809659641. The next prime is 19809659651. The reversal of 19809659650 is 5695690891.

It is not an unprimeable number, because it can be changed into a prime (19809659651) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10485906 + ... + 10487794.

It is an arithmetic number, because the mean of its divisors is an integer number (437667300).

Almost surely, 2^19809659650 is an apocalyptic number.

19809659650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19809659650 is an abundant number, since it is smaller than the sum of its proper divisors (22206401150).

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

19809659650 is a wasteful number, since it uses less digits than its factorization.

19809659650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2764 (or 2759 counting only the distinct ones).

The product of its (nonzero) digits is 5248800, while the sum is 58.

The spelling of 19809659650 in words is "nineteen billion, eight hundred nine million, six hundred fifty-nine thousand, six hundred fifty".