206164556121 has 16 divisors (see below), whose sum is σ = 275463422784. Its totient is φ = 137154515904.

The previous prime is 206164556089. The next prime is 206164556137. The reversal of 206164556121 is 121655461602.

It is not a de Polignac number, because 206164556121 - 2⁵ = 206164556089 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 206164556121.

It is not an unprimeable number, because it can be changed into a prime (206164516121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6060466 + ... + 6094388.

It is an arithmetic number, because the mean of its divisors is an integer number (17216463924).

Almost surely, 2^206164556121 is an apocalyptic number.

It is an amenable number.

206164556121 is a deficient number, since it is larger than the sum of its proper divisors (69298866663).

206164556121 is a wasteful number, since it uses less digits than its factorization.

206164556121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38120.

The product of its (nonzero) digits is 86400, while the sum is 39.

The spelling of 206164556121 in words is "two hundred six billion, one hundred sixty-four million, five hundred fifty-six thousand, one hundred twenty-one".