208240848257 has 4 divisors (see below), whose sum is σ = 224259375060. Its totient is φ = 192222321456.

The previous prime is 208240848241. The next prime is 208240848269. The reversal of 208240848257 is 752848042802.

It is a happy number.

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 33095250241 + 175145598016 = 181921^2 + 418504^2 .

It is a cyclic number.

It is not a de Polignac number, because 208240848257 - 2⁴ = 208240848241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (208240848457) 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, 8009263382 + ... + 8009263407.

It is an arithmetic number, because the mean of its divisors is an integer number (56064843765).

Almost surely, 2^208240848257 is an apocalyptic number.

It is an amenable number.

208240848257 is a deficient number, since it is larger than the sum of its proper divisors (16018526803).

208240848257 is a wasteful number, since it uses less digits than its factorization.

208240848257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16018526802.

The product of its (nonzero) digits is 2293760, while the sum is 50.

The spelling of 208240848257 in words is "two hundred eight billion, two hundred forty million, eight hundred forty-eight thousand, two hundred fifty-seven".