206144885081 has 4 divisors (see below), whose sum is σ = 206383756032. Its totient is φ = 205906014132.

The previous prime is 206144885059. The next prime is 206144885083. The reversal of 206144885081 is 180588441602.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 206144885081 - 2²⁶ = 206077776217 is a prime.

It is a super-2 number, since 2×206144885081² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206144885083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119434181 + ... + 119435906.

It is an arithmetic number, because the mean of its divisors is an integer number (51595939008).

Almost surely, 2^206144885081 is an apocalyptic number.

It is an amenable number.

206144885081 is a deficient number, since it is larger than the sum of its proper divisors (238870951).

206144885081 is an equidigital number, since it uses as much as digits as its factorization.

206144885081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238870950.

The product of its (nonzero) digits is 491520, while the sum is 47.

The spelling of 206144885081 in words is "two hundred six billion, one hundred forty-four million, eight hundred eighty-five thousand, eighty-one".