19909774411 has 2 divisors, whose sum is σ = 19909774412. Its totient is φ = 19909774410.

The previous prime is 19909774399. The next prime is 19909774427. The reversal of 19909774411 is 11447790991.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19909774411 - 2¹⁷ = 19909643339 is a prime.

It is a super-3 number, since 3×19909774411³ (a number of 32 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (19909771411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9954887205 + 9954887206.

It is an arithmetic number, because the mean of its divisors is an integer number (9954887206).

Almost surely, 2^19909774411 is an apocalyptic number.

19909774411 is a deficient number, since it is larger than the sum of its proper divisors (1).

19909774411 is an equidigital number, since it uses as much as digits as its factorization.

19909774411 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 571536, while the sum is 52.

The spelling of 19909774411 in words is "nineteen billion, nine hundred nine million, seven hundred seventy-four thousand, four hundred eleven".