206621213611 has 2 divisors, whose sum is σ = 206621213612. Its totient is φ = 206621213610.

The previous prime is 206621213593. The next prime is 206621213627. The reversal of 206621213611 is 116312126602.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206621213611 is a prime.

It is not a weakly prime, because it can be changed into another prime (206621213641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103310606805 + 103310606806.

It is an arithmetic number, because the mean of its divisors is an integer number (103310606806).

Almost surely, 2^206621213611 is an apocalyptic number.

206621213611 is a deficient number, since it is larger than the sum of its proper divisors (1).

206621213611 is an equidigital number, since it uses as much as digits as its factorization.

206621213611 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 31.

The spelling of 206621213611 in words is "two hundred six billion, six hundred twenty-one million, two hundred thirteen thousand, six hundred eleven".