206121006165 has 16 divisors (see below), whose sum is σ = 340432114176. Its totient is φ = 106385035200.

The previous prime is 206121006149. The next prime is 206121006193. The reversal of 206121006165 is 561600121602.

It is not a de Polignac number, because 206121006165 - 2⁴ = 206121006149 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 221635026 + ... + 221635955.

It is an arithmetic number, because the mean of its divisors is an integer number (21277007136).

Almost surely, 2^206121006165 is an apocalyptic number.

It is an amenable number.

206121006165 is a deficient number, since it is larger than the sum of its proper divisors (134311108011).

206121006165 is a wasteful number, since it uses less digits than its factorization.

206121006165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443271020.

The product of its (nonzero) digits is 4320, while the sum is 30.

Adding to 206121006165 its reverse (561600121602), we get a palindrome (767721127767).

The spelling of 206121006165 in words is "two hundred six billion, one hundred twenty-one million, six thousand, one hundred sixty-five".