208128850457 has 16 divisors (see below), whose sum is σ = 227432038464. Its totient is φ = 188889624000.

The previous prime is 208128850441. The next prime is 208128850471. The reversal of 208128850457 is 754058821802.

It is not a de Polignac number, because 208128850457 - 2⁴ = 208128850441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (208128852457) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26827223 + ... + 26834979.

It is an arithmetic number, because the mean of its divisors is an integer number (14214502404).

Almost surely, 2^208128850457 is an apocalyptic number.

It is an amenable number.

208128850457 is a deficient number, since it is larger than the sum of its proper divisors (19303188007).

208128850457 is a wasteful number, since it uses less digits than its factorization.

208128850457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11560.

The product of its (nonzero) digits is 1433600, while the sum is 50.

The spelling of 208128850457 in words is "two hundred eight billion, one hundred twenty-eight million, eight hundred fifty thousand, four hundred fifty-seven".