209228213766 has 32 divisors (see below), whose sum is σ = 491613147648. Its totient is φ = 58525374240.

The previous prime is 209228213729. The next prime is 209228213767. The reversal of 209228213766 is 667312822902.

209228213766 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209228213767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121927006 + ... + 121928721.

It is an arithmetic number, because the mean of its divisors is an integer number (15362910864).

Almost surely, 2^209228213766 is an apocalyptic number.

209228213766 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

209228213766 is an abundant number, since it is smaller than the sum of its proper divisors (282384933882).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

209228213766 is a wasteful number, since it uses less digits than its factorization.

209228213766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243855756.

The product of its (nonzero) digits is 870912, while the sum is 48.

The spelling of 209228213766 in words is "two hundred nine billion, two hundred twenty-eight million, two hundred thirteen thousand, seven hundred sixty-six".