208097003561 has 4 divisors (see below), whose sum is σ = 217144699392. Its totient is φ = 199049307732.

The previous prime is 208097003537. The next prime is 208097003581. The reversal of 208097003561 is 165300790802.

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 208097003561 - 2²² = 208092809257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (208097003581) 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, 4523847881 + ... + 4523847926.

It is an arithmetic number, because the mean of its divisors is an integer number (54286174848).

Almost surely, 2^208097003561 is an apocalyptic number.

It is an amenable number.

208097003561 is a deficient number, since it is larger than the sum of its proper divisors (9047695831).

208097003561 is an equidigital number, since it uses as much as digits as its factorization.

208097003561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9047695830.

The product of its (nonzero) digits is 90720, while the sum is 41.

The spelling of 208097003561 in words is "two hundred eight billion, ninety-seven million, three thousand, five hundred sixty-one".