19660099 has 2 divisors, whose sum is σ = 19660100. Its totient is φ = 19660098.

The previous prime is 19660097. The next prime is 19660133. The reversal of 19660099 is 99006691.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19660099 - 2¹ = 19660097 is a prime.

Together with 19660097, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (19660097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9830049 + 9830050.

It is an arithmetic number, because the mean of its divisors is an integer number (9830050).

Almost surely, 2^19660099 is an apocalyptic number.

19660099 is a deficient number, since it is larger than the sum of its proper divisors (1).

19660099 is an equidigital number, since it uses as much as digits as its factorization.

19660099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26244, while the sum is 40.

The square root of 19660099 is about 4433.9710193009. The cubic root of 19660099 is about 269.8952451420.

The spelling of 19660099 in words is "nineteen million, six hundred sixty thousand, ninety-nine".