20191475659 has 4 divisors (see below), whose sum is σ = 20533704120. Its totient is φ = 19849247200.

The previous prime is 20191475641. The next prime is 20191475663. The reversal of 20191475659 is 95657419102.

It is a happy number.

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 20191475659 - 2¹³ = 20191467467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20191475669) 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, 171114142 + ... + 171114259.

It is an arithmetic number, because the mean of its divisors is an integer number (5133426030).

Almost surely, 2^20191475659 is an apocalyptic number.

20191475659 is a deficient number, since it is larger than the sum of its proper divisors (342228461).

20191475659 is an equidigital number, since it uses as much as digits as its factorization.

20191475659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342228460.

The product of its (nonzero) digits is 680400, while the sum is 49.

The spelling of 20191475659 in words is "twenty billion, one hundred ninety-one million, four hundred seventy-five thousand, six hundred fifty-nine".