19623749011 has 2 divisors, whose sum is σ = 19623749012. Its totient is φ = 19623749010.

The previous prime is 19623748997. The next prime is 19623749039. The reversal of 19623749011 is 11094732691.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19623749011 - 2⁷ = 19623748883 is a prime.

It is not a weakly prime, because it can be changed into another prime (19623749071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9811874505 + 9811874506.

It is an arithmetic number, because the mean of its divisors is an integer number (9811874506).

Almost surely, 2^19623749011 is an apocalyptic number.

19623749011 is a deficient number, since it is larger than the sum of its proper divisors (1).

19623749011 is an equidigital number, since it uses as much as digits as its factorization.

19623749011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 43.

The spelling of 19623749011 in words is "nineteen billion, six hundred twenty-three million, seven hundred forty-nine thousand, eleven".