206121166511 has 8 divisors (see below), whose sum is σ = 222004967184. Its totient is φ = 190241412480.

The previous prime is 206121166477. The next prime is 206121166513. The reversal of 206121166511 is 115661121602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206121166511 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206121166513) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 905450 + ... + 1109991.

It is an arithmetic number, because the mean of its divisors is an integer number (27750620898).

Almost surely, 2^206121166511 is an apocalyptic number.

206121166511 is a deficient number, since it is larger than the sum of its proper divisors (15883800673).

206121166511 is a wasteful number, since it uses less digits than its factorization.

206121166511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2023321.

The product of its (nonzero) digits is 4320, while the sum is 32.

The spelling of 206121166511 in words is "two hundred six billion, one hundred twenty-one million, one hundred sixty-six thousand, five hundred eleven".