206811540105 has 32 divisors (see below), whose sum is σ = 339522744960. Its totient is φ = 107433515520.

The previous prime is 206811540083. The next prime is 206811540113. The reversal of 206811540105 is 501045118602.

It is not a de Polignac number, because 206811540105 - 2⁹ = 206811539593 is a prime.

It is a super-2 number, since 2×206811540105² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 102706 + ... + 651284.

It is an arithmetic number, because the mean of its divisors is an integer number (10610085780).

Almost surely, 2^206811540105 is an apocalyptic number.

It is an amenable number.

206811540105 is a deficient number, since it is larger than the sum of its proper divisors (132711204855).

206811540105 is a wasteful number, since it uses less digits than its factorization.

206811540105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549241.

The product of its (nonzero) digits is 9600, while the sum is 33.

Adding to 206811540105 its reverse (501045118602), we get a palindrome (707856658707).

The spelling of 206811540105 in words is "two hundred six billion, eight hundred eleven million, five hundred forty thousand, one hundred five".