209677363845 has 16 divisors (see below), whose sum is σ = 343666314432. Its totient is φ = 109100416640.

The previous prime is 209677363837. The next prime is 209677363849. The reversal of 209677363845 is 548363776902.

209677363845 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 209677363845 - 2³ = 209677363837 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209677363849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 170468787 + ... + 170470016.

It is an arithmetic number, because the mean of its divisors is an integer number (21479144652).

Almost surely, 2^209677363845 is an apocalyptic number.

It is an amenable number.

209677363845 is a deficient number, since it is larger than the sum of its proper divisors (133988950587).

209677363845 is a wasteful number, since it uses less digits than its factorization.

209677363845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340938852.

The product of its (nonzero) digits is 45722880, while the sum is 60.

The spelling of 209677363845 in words is "two hundred nine billion, six hundred seventy-seven million, three hundred sixty-three thousand, eight hundred forty-five".