19809659651 has 2 divisors, whose sum is σ = 19809659652. Its totient is φ = 19809659650.

The previous prime is 19809659641. The next prime is 19809659657. The reversal of 19809659651 is 15695690891.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19809659651 - 2¹⁴ = 19809643267 is a prime.

It is not a weakly prime, because it can be changed into another prime (19809659657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9904829825 + 9904829826.

It is an arithmetic number, because the mean of its divisors is an integer number (9904829826).

Almost surely, 2^19809659651 is an apocalyptic number.

19809659651 is a deficient number, since it is larger than the sum of its proper divisors (1).

19809659651 is an equidigital number, since it uses as much as digits as its factorization.

19809659651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5248800, while the sum is 59.

The spelling of 19809659651 in words is "nineteen billion, eight hundred nine million, six hundred fifty-nine thousand, six hundred fifty-one".