19996805827 has 2 divisors, whose sum is σ = 19996805828. Its totient is φ = 19996805826.

The previous prime is 19996805813. The next prime is 19996805837. The reversal of 19996805827 is 72850869991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19996805827 - 2¹¹ = 19996803779 is a prime.

It is not a weakly prime, because it can be changed into another prime (19996805837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9998402913 + 9998402914.

It is an arithmetic number, because the mean of its divisors is an integer number (9998402914).

Almost surely, 2^19996805827 is an apocalyptic number.

19996805827 is a deficient number, since it is larger than the sum of its proper divisors (1).

19996805827 is an equidigital number, since it uses as much as digits as its factorization.

19996805827 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19595520, while the sum is 64.

The spelling of 19996805827 in words is "nineteen billion, nine hundred ninety-six million, eight hundred five thousand, eight hundred twenty-seven".