206220067897 has 4 divisors (see below), whose sum is σ = 206564342400. Its totient is φ = 205875793396.

The previous prime is 206220067883. The next prime is 206220067903. The reversal of 206220067897 is 798760022602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206220067897 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 206220067897.

It is not an unprimeable number, because it can be changed into a prime (206220065897) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 172136353 + ... + 172137550.

It is an arithmetic number, because the mean of its divisors is an integer number (51641085600).

Almost surely, 2^206220067897 is an apocalyptic number.

It is an amenable number.

206220067897 is a deficient number, since it is larger than the sum of its proper divisors (344274503).

206220067897 is an equidigital number, since it uses as much as digits as its factorization.

206220067897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344274502.

The product of its (nonzero) digits is 1016064, while the sum is 49.

The spelling of 206220067897 in words is "two hundred six billion, two hundred twenty million, sixty-seven thousand, eight hundred ninety-seven".