208505505764 has 48 divisors (see below), whose sum is σ = 369925118976. Its totient is φ = 102825072000.

The previous prime is 208505505763. The next prime is 208505505827. The reversal of 208505505764 is 467505505802.

208505505764 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (208505505763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56703494 + ... + 56707170.

It is an arithmetic number, because the mean of its divisors is an integer number (7706773312).

Almost surely, 2^208505505764 is an apocalyptic number.

It is an amenable number.

208505505764 is a deficient number, since it is larger than the sum of its proper divisors (161419613212).

208505505764 is a wasteful number, since it uses less digits than its factorization.

208505505764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4476 (or 4474 counting only the distinct ones).

The product of its (nonzero) digits is 1680000, while the sum is 47.

The spelling of 208505505764 in words is "two hundred eight billion, five hundred five million, five hundred five thousand, seven hundred sixty-four".