19961203785 has 32 divisors (see below), whose sum is σ = 32352473088. Its totient is φ = 10508464320.

The previous prime is 19961203783. The next prime is 19961203793. The reversal of 19961203785 is 58730216991.

It is not a de Polignac number, because 19961203785 - 2¹ = 19961203783 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19961203783) by changing a digit.

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, 459724 + ... + 501266.

It is an arithmetic number, because the mean of its divisors is an integer number (1011014784).

Almost surely, 2^19961203785 is an apocalyptic number.

19961203785 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19961203785 is a deficient number, since it is larger than the sum of its proper divisors (12391269303).

19961203785 is a wasteful number, since it uses less digits than its factorization.

19961203785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41965.

The product of its (nonzero) digits is 816480, while the sum is 51.

The spelling of 19961203785 in words is "nineteen billion, nine hundred sixty-one million, two hundred three thousand, seven hundred eighty-five".