209798682155 has 8 divisors (see below), whose sum is σ = 251961949392. Its totient is φ = 167703258528.

The previous prime is 209798682139. The next prime is 209798682173. The reversal of 209798682155 is 551286897902.

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

It is a cyclic number.

It is not a de Polignac number, because 209798682155 - 2⁴ = 209798682139 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16954097 + ... + 16966466.

It is an arithmetic number, because the mean of its divisors is an integer number (31495243674).

Almost surely, 2^209798682155 is an apocalyptic number.

209798682155 is a deficient number, since it is larger than the sum of its proper divisors (42163267237).

209798682155 is a wasteful number, since it uses less digits than its factorization.

209798682155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33921805.

The product of its (nonzero) digits is 21772800, while the sum is 62.

The spelling of 209798682155 in words is "two hundred nine billion, seven hundred ninety-eight million, six hundred eighty-two thousand, one hundred fifty-five".