206358029891 has 4 divisors (see below), whose sum is σ = 222231724512. Its totient is φ = 190484335272.

The previous prime is 206358029833. The next prime is 206358029951. The reversal of 206358029891 is 198920853602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 206358029891 - 2⁶ = 206358029827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206358029821) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 7936847291 + ... + 7936847316.

It is an arithmetic number, because the mean of its divisors is an integer number (55557931128).

Almost surely, 2^206358029891 is an apocalyptic number.

206358029891 is a deficient number, since it is larger than the sum of its proper divisors (15873694621).

206358029891 is a wasteful number, since it uses less digits than its factorization.

206358029891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15873694620.

The product of its (nonzero) digits is 1866240, while the sum is 53.

The spelling of 206358029891 in words is "two hundred six billion, three hundred fifty-eight million, twenty-nine thousand, eight hundred ninety-one".