209745159611 has 12 divisors (see below), whose sum is σ = 227487526920. Its totient is φ = 193298040000.

The previous prime is 209745159607. The next prime is 209745159671. The reversal of 209745159611 is 116951547902.

It is a happy number.

It is not a de Polignac number, because 209745159611 - 2² = 209745159607 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 209745159611.

It is not an unprimeable number, because it can be changed into a prime (209745159671) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 897890 + ... + 1107111.

It is an arithmetic number, because the mean of its divisors is an integer number (18957293910).

Almost surely, 2^209745159611 is an apocalyptic number.

209745159611 is a deficient number, since it is larger than the sum of its proper divisors (17742367309).

209745159611 is a wasteful number, since it uses less digits than its factorization.

209745159611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2005646 (or 2005633 counting only the distinct ones).

The product of its (nonzero) digits is 680400, while the sum is 50.

The spelling of 209745159611 in words is "two hundred nine billion, seven hundred forty-five million, one hundred fifty-nine thousand, six hundred eleven".