209745378758 has 8 divisors (see below), whose sum is σ = 321934767528. Its totient is φ = 102433789584.

The previous prime is 209745378749. The next prime is 209745378763. The reversal of 209745378758 is 857873547902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 209745378694 and 209745378703.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1219449791 + ... + 1219449962.

It is an arithmetic number, because the mean of its divisors is an integer number (40241845941).

Almost surely, 2^209745378758 is an apocalyptic number.

209745378758 is a deficient number, since it is larger than the sum of its proper divisors (112189388770).

209745378758 is a wasteful number, since it uses less digits than its factorization.

209745378758 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2438899798.

The product of its (nonzero) digits is 118540800, while the sum is 65.

The spelling of 209745378758 in words is "two hundred nine billion, seven hundred forty-five million, three hundred seventy-eight thousand, seven hundred fifty-eight".