209015485217 has 16 divisors (see below), whose sum is σ = 268996890624. Its totient is φ = 157615362000.

The previous prime is 209015485213. The next prime is 209015485219. The reversal of 209015485217 is 712584510902.

It is a cyclic number.

It is not a de Polignac number, because 209015485217 - 2² = 209015485213 is a prime.

It is not an unprimeable number, because it can be changed into a prime (209015485213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43779659 + ... + 43784432.

It is an arithmetic number, because the mean of its divisors is an integer number (16812305664).

Almost surely, 2^209015485217 is an apocalyptic number.

It is an amenable number.

209015485217 is a deficient number, since it is larger than the sum of its proper divisors (59981405407).

209015485217 is a wasteful number, since it uses less digits than its factorization.

209015485217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87564140.

The product of its (nonzero) digits is 201600, while the sum is 44.

The spelling of 209015485217 in words is "two hundred nine billion, fifteen million, four hundred eighty-five thousand, two hundred seventeen".