209885610071 has 2 divisors, whose sum is σ = 209885610072. Its totient is φ = 209885610070.

The previous prime is 209885610031. The next prime is 209885610079. The reversal of 209885610071 is 170016588902.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-209885610071 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 209885609998 and 209885610025.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209885610079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104942805035 + 104942805036.

It is an arithmetic number, because the mean of its divisors is an integer number (104942805036).

Almost surely, 2^209885610071 is an apocalyptic number.

209885610071 is a deficient number, since it is larger than the sum of its proper divisors (1).

209885610071 is an equidigital number, since it uses as much as digits as its factorization.

209885610071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 241920, while the sum is 47.

The spelling of 209885610071 in words is "two hundred nine billion, eight hundred eighty-five million, six hundred ten thousand, seventy-one".