206391857798 has 32 divisors (see below), whose sum is σ = 359900405760. Its totient is φ = 86942250720.

The previous prime is 206391857773. The next prime is 206391857801. The reversal of 206391857798 is 897758193602.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 171773 + ... + 665048.

It is an arithmetic number, because the mean of its divisors is an integer number (11246887680).

Almost surely, 2^206391857798 is an apocalyptic number.

206391857798 is a deficient number, since it is larger than the sum of its proper divisors (153508547962).

206391857798 is a wasteful number, since it uses less digits than its factorization.

206391857798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 837132.

The product of its (nonzero) digits is 45722880, while the sum is 65.

The spelling of 206391857798 in words is "two hundred six billion, three hundred ninety-one million, eight hundred fifty-seven thousand, seven hundred ninety-eight".