19845954079 has 6 divisors (see below), whose sum is σ = 23086109904. Its totient is φ = 17010817740.

The previous prime is 19845954067. The next prime is 19845954091. The reversal of 19845954079 is 97045954891.

It is an interprime number because it is at equal distance from previous prime (19845954067) and next prime (19845954091).

It is not a de Polignac number, because 19845954079 - 2¹³ = 19845945887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19845954979) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 202509687 + ... + 202509784.

It is an arithmetic number, because the mean of its divisors is an integer number (3847684984).

Almost surely, 2^19845954079 is an apocalyptic number.

19845954079 is a deficient number, since it is larger than the sum of its proper divisors (3240155825).

19845954079 is an equidigital number, since it uses as much as digits as its factorization.

19845954079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405019485 (or 405019478 counting only the distinct ones).

The product of its (nonzero) digits is 16329600, while the sum is 61.

The spelling of 19845954079 in words is "nineteen billion, eight hundred forty-five million, nine hundred fifty-four thousand, seventy-nine".