209479226450 has 90 divisors (see below), whose sum is σ = 423204469449. Its totient is φ = 77144227680.

The previous prime is 209479226443. The next prime is 209479226471. The reversal of 209479226450 is 54622974902.

209479226450 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 8 ways, for example, as 133224270001 + 76254956449 = 364999^2 + 276143^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=323635.

It is a Harshad number since it is a multiple of its sum of digits (50).

It is a Duffinian number.

It is a Curzon 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 44 ways as a sum of consecutive naturals, for example, 546942959 + ... + 546943341.

Almost surely, 2^209479226450 is an apocalyptic number.

209479226450 is an abundant number, since it is smaller than the sum of its proper divisors (213725242999).

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

209479226450 is an frugal number, since it uses more digits than its factorization.

209479226450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 830 (or 403 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 50.

Multiplying 209479226450 by its sum of digits (50), we get a square (10473961322500 = 3236350²).

209479226450 divided by its sum of digits (50) gives a square (4189584529 = 64727²).

The spelling of 209479226450 in words is "two hundred nine billion, four hundred seventy-nine million, two hundred twenty-six thousand, four hundred fifty".