206499789585450 has 144 divisors (see below), whose sum is σ = 557516180665080. Its totient is φ = 54796884226560.

The previous prime is 206499789585449. The next prime is 206499789585487. The reversal of 206499789585450 is 54585987994602.

206499789585450 is a `hidden beast` number, since 2 + 0 + 6 + 4 + 9 + 9 + 7 + 89 + 5 + 85 + 450 = 666.

It can be written as a sum of positive squares in 12 ways, for example, as 26209310967009 + 180290478618441 = 5119503^2 + 13427229^2 .

It is a hoax number, since the sum of its digits (81) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 206499789585450.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 192891052 + ... + 193958648.

Almost surely, 2^{206499789585450} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 206499789585450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (278758090332540).

206499789585450 is an abundant number, since it is smaller than the sum of its proper divisors (351016391079630).

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

206499789585450 is a wasteful number, since it uses less digits than its factorization.

206499789585450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1069721 (or 1069713 counting only the distinct ones).

The product of its (nonzero) digits is 7838208000, while the sum is 81.

The spelling of 206499789585450 in words is "two hundred six trillion, four hundred ninety-nine billion, seven hundred eighty-nine million, five hundred eighty-five thousand, four hundred fifty".