208997013569 has 4 divisors (see below), whose sum is σ = 209003714244. Its totient is φ = 208990312896.

The previous prime is 208997013529. The next prime is 208997013607. The reversal of 208997013569 is 965310799802.

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

It can be written as a sum of positive squares in 2 ways, for example, as 119655803569 + 89341210000 = 345913^2 + 298900^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-208997013569 is a prime.

It is a super-2 number, since 2×208997013569² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (208997013529) 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, 3303332 + ... + 3366005.

It is an arithmetic number, because the mean of its divisors is an integer number (52250928561).

Almost surely, 2^208997013569 is an apocalyptic number.

It is an amenable number.

208997013569 is a deficient number, since it is larger than the sum of its proper divisors (6700675).

208997013569 is an equidigital number, since it uses as much as digits as its factorization.

208997013569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6700674.

The product of its (nonzero) digits is 7348320, while the sum is 59.

The spelling of 208997013569 in words is "two hundred eight billion, nine hundred ninety-seven million, thirteen thousand, five hundred sixty-nine".