206778419761 has 8 divisors (see below), whose sum is σ = 210290558400. Its totient is φ = 203266528560.

The previous prime is 206778419741. The next prime is 206778419767. The reversal of 206778419761 is 167914877602.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 206778419761 - 2⁹ = 206778419249 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 206778419696 and 206778419705.

It is not an unprimeable number, because it can be changed into a prime (206778419767) 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, 2555635 + ... + 2635303.

It is an arithmetic number, because the mean of its divisors is an integer number (26286319800).

Almost surely, 2^206778419761 is an apocalyptic number.

It is an amenable number.

206778419761 is a deficient number, since it is larger than the sum of its proper divisors (3512138639).

206778419761 is an equidigital number, since it uses as much as digits as its factorization.

206778419761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123719.

The product of its (nonzero) digits is 7112448, while the sum is 58.

The spelling of 206778419761 in words is "two hundred six billion, seven hundred seventy-eight million, four hundred nineteen thousand, seven hundred sixty-one".