206993161778 has 32 divisors (see below), whose sum is σ = 349740744192. Its totient is φ = 91164427200.

The previous prime is 206993161747. The next prime is 206993161783. The reversal of 206993161778 is 877161399602.

It is a Curzon 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, 159338 + ... + 662853.

It is an arithmetic number, because the mean of its divisors is an integer number (10929398256).

Almost surely, 2^206993161778 is an apocalyptic number.

206993161778 is a deficient number, since it is larger than the sum of its proper divisors (142747582414).

206993161778 is a wasteful number, since it uses less digits than its factorization.

206993161778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 822650.

The product of its (nonzero) digits is 6858432, while the sum is 59.

The spelling of 206993161778 in words is "two hundred six billion, nine hundred ninety-three million, one hundred sixty-one thousand, seven hundred seventy-eight".