19948914779 has 4 divisors (see below), whose sum is σ = 19954253880. Its totient is φ = 19943575680.

The previous prime is 19948914751. The next prime is 19948914833. The reversal of 19948914779 is 97741984991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 19948914779 - 2¹⁶ = 19948849243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19948914679) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2663942 + ... + 2671419.

It is an arithmetic number, because the mean of its divisors is an integer number (4988563470).

Almost surely, 2^19948914779 is an apocalyptic number.

19948914779 is a deficient number, since it is larger than the sum of its proper divisors (5339101).

19948914779 is an equidigital number, since it uses as much as digits as its factorization.

19948914779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5339100.

The product of its digits is 41150592, while the sum is 68.

The spelling of 19948914779 in words is "nineteen billion, nine hundred forty-eight million, nine hundred fourteen thousand, seven hundred seventy-nine".