208054645650 has 72 divisors (see below), whose sum is σ = 559180726884. Its totient is φ = 55460668800.

The previous prime is 208054645637. The next prime is 208054645661. The reversal of 208054645650 is 56546450802.

208054645650 is a `hidden beast` number, since 2 + 0 + 8 + 0 + 546 + 4 + 56 + 50 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 19359104769 + 188695540881 = 139137^2 + 434391^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 208054645596 and 208054645605.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1149112 + ... + 1317788.

Almost surely, 2^208054645650 is an apocalyptic number.

208054645650 is an abundant number, since it is smaller than the sum of its proper divisors (351126081234).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

208054645650 is a wasteful number, since it uses less digits than its factorization.

208054645650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171436 (or 171428 counting only the distinct ones).

The product of its (nonzero) digits is 1152000, while the sum is 45.

The spelling of 208054645650 in words is "two hundred eight billion, fifty-four million, six hundred forty-five thousand, six hundred fifty".