209155339079 has 16 divisors (see below), whose sum is σ = 225806676480. Its totient is φ = 193089718080.

The previous prime is 209155339069. The next prime is 209155339163. The reversal of 209155339079 is 970933551902.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-209155339079 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 209155339079.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209155339009) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 55139 + ... + 649115.

It is an arithmetic number, because the mean of its divisors is an integer number (14112917280).

Almost surely, 2^209155339079 is an apocalyptic number.

209155339079 is a deficient number, since it is larger than the sum of its proper divisors (16651337401).

209155339079 is a wasteful number, since it uses less digits than its factorization.

209155339079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 594470.

The product of its (nonzero) digits is 2296350, while the sum is 53.

The spelling of 209155339079 in words is "two hundred nine billion, one hundred fifty-five million, three hundred thirty-nine thousand, seventy-nine".