19679883409 has 2 divisors, whose sum is σ = 19679883410. Its totient is φ = 19679883408.

The previous prime is 19679883361. The next prime is 19679883413. The reversal of 19679883409 is 90438897691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16439086225 + 3240797184 = 128215^2 + 56928^2 .

It is a cyclic number.

It is not a de Polignac number, because 19679883409 - 2⁹ = 19679882897 is a prime.

It is a super-2 number, since 2×19679883409² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19679883469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9839941704 + 9839941705.

It is an arithmetic number, because the mean of its divisors is an integer number (9839941705).

Almost surely, 2^19679883409 is an apocalyptic number.

It is an amenable number.

19679883409 is a deficient number, since it is larger than the sum of its proper divisors (1).

19679883409 is an equidigital number, since it uses as much as digits as its factorization.

19679883409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23514624, while the sum is 64.

The spelling of 19679883409 in words is "nineteen billion, six hundred seventy-nine million, eight hundred eighty-three thousand, four hundred nine".