19660499 has 2 divisors, whose sum is σ = 19660500. Its totient is φ = 19660498.

The previous prime is 19660477. The next prime is 19660507. The reversal of 19660499 is 99406691.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19660499 is a prime.

It is not a weakly prime, because it can be changed into another prime (19660099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9830249 + 9830250.

It is an arithmetic number, because the mean of its divisors is an integer number (9830250).

Almost surely, 2^19660499 is an apocalyptic number.

19660499 is a deficient number, since it is larger than the sum of its proper divisors (1).

19660499 is an equidigital number, since it uses as much as digits as its factorization.

19660499 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 104976, while the sum is 44.

The square root of 19660499 is about 4434.0161253654. The cubic root of 19660499 is about 269.8970755391.

The spelling of 19660499 in words is "nineteen million, six hundred sixty thousand, four hundred ninety-nine".