19745959747 has 4 divisors (see below), whose sum is σ = 20604479760. Its totient is φ = 18887439736.

The previous prime is 19745959711. The next prime is 19745959757. The reversal of 19745959747 is 74795954791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74795954791 = 24239 ⋅3085769.

It is not a de Polignac number, because 19745959747 - 2²⁷ = 19611742019 is a prime.

It is a Smith number, since the sum of its digits (67) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19745959757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 429259972 + ... + 429260017.

It is an arithmetic number, because the mean of its divisors is an integer number (5151119940).

Almost surely, 2^19745959747 is an apocalyptic number.

19745959747 is a deficient number, since it is larger than the sum of its proper divisors (858520013).

19745959747 is an equidigital number, since it uses as much as digits as its factorization.

19745959747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 858520012.

The product of its digits is 100018800, while the sum is 67.

The spelling of 19745959747 in words is "nineteen billion, seven hundred forty-five million, nine hundred fifty-nine thousand, seven hundred forty-seven".