208480220861 has 4 divisors (see below), whose sum is σ = 227432968224. Its totient is φ = 189527473500.

The previous prime is 208480220843. The next prime is 208480220887. The reversal of 208480220861 is 168022084802.

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 208480220861 - 2⁶ = 208480220797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208480222861) 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, 9476373665 + ... + 9476373686.

It is an arithmetic number, because the mean of its divisors is an integer number (56858242056).

Almost surely, 2^208480220861 is an apocalyptic number.

It is an amenable number.

208480220861 is a deficient number, since it is larger than the sum of its proper divisors (18952747363).

208480220861 is a wasteful number, since it uses less digits than its factorization.

208480220861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18952747362.

The product of its (nonzero) digits is 98304, while the sum is 41.

The spelling of 208480220861 in words is "two hundred eight billion, four hundred eighty million, two hundred twenty thousand, eight hundred sixty-one".