209745765894 has 16 divisors (see below), whose sum is σ = 479418893568. Its totient is φ = 59927361672.

The previous prime is 209745765869. The next prime is 209745765913. The reversal of 209745765894 is 498567547902.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2496973362 + ... + 2496973445.

It is an arithmetic number, because the mean of its divisors is an integer number (29963680848).

Almost surely, 2^209745765894 is an apocalyptic number.

209745765894 is an abundant number, since it is smaller than the sum of its proper divisors (269673127674).

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

209745765894 is a wasteful number, since it uses less digits than its factorization.

209745765894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4993946819.

The product of its (nonzero) digits is 152409600, while the sum is 66.

The spelling of 209745765894 in words is "two hundred nine billion, seven hundred forty-five million, seven hundred sixty-five thousand, eight hundred ninety-four".