19609540768 has 12 divisors (see below), whose sum is σ = 38606283450. Its totient is φ = 9804770368.

The previous prime is 19609540763. The next prime is 19609540777. The reversal of 19609540768 is 86704590691.

It can be written as a sum of positive squares in only one way, i.e., 17969938704 + 1639602064 = 134052^2 + 40492^2 .

It is not an unprimeable number, because it can be changed into a prime (19609540763) by changing a digit.

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 as a sum of consecutive naturals, namely, 306399043 + ... + 306399106.

Almost surely, 2^19609540768 is an apocalyptic number.

It is an amenable number.

19609540768 is a deficient number, since it is larger than the sum of its proper divisors (18996742682).

19609540768 is an equidigital number, since it uses as much as digits as its factorization.

19609540768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 612798159 (or 612798151 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 55.

The spelling of 19609540768 in words is "nineteen billion, six hundred nine million, five hundred forty thousand, seven hundred sixty-eight".