209396823564 has 96 divisors (see below), whose sum is σ = 506406297600. Its totient is φ = 67273113600.

The previous prime is 209396823563. The next prime is 209396823589. The reversal of 209396823564 is 465328693902.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (209396823563) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 147150957 + ... + 147152379.

It is an arithmetic number, because the mean of its divisors is an integer number (5275065600).

Almost surely, 2^209396823564 is an apocalyptic number.

It is an amenable number.

209396823564 is an abundant number, since it is smaller than the sum of its proper divisors (297009474036).

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

209396823564 is a wasteful number, since it uses less digits than its factorization.

209396823564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2791 (or 2789 counting only the distinct ones).

The product of its (nonzero) digits is 16796160, while the sum is 57.

The spelling of 209396823564 in words is "two hundred nine billion, three hundred ninety-six million, eight hundred twenty-three thousand, five hundred sixty-four".