208445854851 has 24 divisors (see below), whose sum is σ = 324819069120. Its totient is φ = 128048893056.

The previous prime is 208445854843. The next prime is 208445854907. The reversal of 208445854851 is 158458544802.

It is a happy number.

208445854851 is a `hidden beast` number, since 2 + 0 + 8 + 4 + 4 + 585 + 4 + 8 + 51 = 666.

It is not a de Polignac number, because 208445854851 - 2³ = 208445854843 is a prime.

It is not an unprimeable number, because it can be changed into a prime (208445854051) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1498971 + ... + 1632116.

It is an arithmetic number, because the mean of its divisors is an integer number (13534127880).

Almost surely, 2^208445854851 is an apocalyptic number.

208445854851 is a deficient number, since it is larger than the sum of its proper divisors (116373214269).

208445854851 is a wasteful number, since it uses less digits than its factorization.

208445854851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3131675 (or 3131672 counting only the distinct ones).

The product of its (nonzero) digits is 8192000, while the sum is 54.

The spelling of 208445854851 in words is "two hundred eight billion, four hundred forty-five million, eight hundred fifty-four thousand, eight hundred fifty-one".