20889191599 has 2 divisors, whose sum is σ = 20889191600. Its totient is φ = 20889191598.

The previous prime is 20889191597. The next prime is 20889191611. The reversal of 20889191599 is 99519198802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20889191599 - 2¹ = 20889191597 is a prime.

Together with 20889191597, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20889191591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10444595799 + 10444595800.

It is an arithmetic number, because the mean of its divisors is an integer number (10444595800).

Almost surely, 2^20889191599 is an apocalyptic number.

20889191599 is a deficient number, since it is larger than the sum of its proper divisors (1).

20889191599 is an equidigital number, since it uses as much as digits as its factorization.

20889191599 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4199040, while the sum is 61.

The spelling of 20889191599 in words is "twenty billion, eight hundred eighty-nine million, one hundred ninety-one thousand, five hundred ninety-nine".