19660159 has 4 divisors (see below), whose sum is σ = 20117416. Its totient is φ = 19202904.

The previous prime is 19660153. The next prime is 19660163. The reversal of 19660159 is 95106691.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 19660159 - 2⁷ = 19660031 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19660153) 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 in 3 ways as a sum of consecutive naturals, for example, 228564 + ... + 228649.

It is an arithmetic number, because the mean of its divisors is an integer number (5029354).

Almost surely, 2^19660159 is an apocalyptic number.

19660159 is a deficient number, since it is larger than the sum of its proper divisors (457257).

19660159 is an equidigital number, since it uses as much as digits as its factorization.

19660159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457256.

The product of its (nonzero) digits is 14580, while the sum is 37.

The square root of 19660159 is about 4433.9777852398. The cubic root of 19660159 is about 269.8955197031.

The spelling of 19660159 in words is "nineteen million, six hundred sixty thousand, one hundred fifty-nine".