206975565978 has 32 divisors (see below), whose sum is σ = 428711693760. Its totient is φ = 66537166080.

The previous prime is 206975565977. The next prime is 206975565989. The reversal of 206975565978 is 879565579602.

It is not an unprimeable number, because it can be changed into a prime (206975565977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 521800 + ... + 828387.

It is an arithmetic number, because the mean of its divisors is an integer number (13397240430).

Almost surely, 2^206975565978 is an apocalyptic number.

206975565978 is an abundant number, since it is smaller than the sum of its proper divisors (221736127782).

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

206975565978 is a wasteful number, since it uses less digits than its factorization.

206975565978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1351102.

The product of its (nonzero) digits is 285768000, while the sum is 69.

The spelling of 206975565978 in words is "two hundred six billion, nine hundred seventy-five million, five hundred sixty-five thousand, nine hundred seventy-eight".