1608849889921 has 4 divisors (see below), whose sum is σ = 1608854532912. Its totient is φ = 1608845246932.

The previous prime is 1608849889873. The next prime is 1608849889949. The reversal of 1608849889921 is 1299889488061.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1608849889921 - 2¹¹ = 1608849887873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1608849889951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1755775 + ... + 2510068.

It is an arithmetic number, because the mean of its divisors is an integer number (402213633228).

Almost surely, 2^{1608849889921} is an apocalyptic number.

It is an amenable number.

1608849889921 is a deficient number, since it is larger than the sum of its proper divisors (4642991).

1608849889921 is an equidigital number, since it uses as much as digits as its factorization.

1608849889921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4642990.

The product of its (nonzero) digits is 143327232, while the sum is 73.

The spelling of 1608849889921 in words is "one trillion, six hundred eight billion, eight hundred forty-nine million, eight hundred eighty-nine thousand, nine hundred twenty-one".