209122864884 has 30 divisors (see below), whose sum is σ = 546688477874. Its totient is φ = 69707621520.

The previous prime is 209122864871. The next prime is 209122864903. The reversal of 209122864884 is 488468221902.

209122864884 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 182756250000 + 26366614884 = 427500^2 + 162378^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 209122864884.

It is a congruent number.

It is an unprimeable number.

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 9 ways as a sum of consecutive naturals, for example, 322720147 + ... + 322720794.

Almost surely, 2^209122864884 is an apocalyptic number.

It is an amenable number.

209122864884 is an abundant number, since it is smaller than the sum of its proper divisors (337565612990).

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

209122864884 is a wasteful number, since it uses less digits than its factorization.

209122864884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645440957 (or 645440946 counting only the distinct ones).

The product of its (nonzero) digits is 3538944, while the sum is 54.

The spelling of 209122864884 in words is "two hundred nine billion, one hundred twenty-two million, eight hundred sixty-four thousand, eight hundred eighty-four".