19533872779 has 2 divisors, whose sum is σ = 19533872780. Its totient is φ = 19533872778.

The previous prime is 19533872747. The next prime is 19533872789. The reversal of 19533872779 is 97727833591.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19533872779 - 2⁵ = 19533872747 is a prime.

It is not a weakly prime, because it can be changed into another prime (19533872789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9766936389 + 9766936390.

It is an arithmetic number, because the mean of its divisors is an integer number (9766936390).

Almost surely, 2^19533872779 is an apocalyptic number.

19533872779 is a deficient number, since it is larger than the sum of its proper divisors (1).

19533872779 is an equidigital number, since it uses as much as digits as its factorization.

19533872779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20003760, while the sum is 61.

The spelling of 19533872779 in words is "nineteen billion, five hundred thirty-three million, eight hundred seventy-two thousand, seven hundred seventy-nine".