209355632639 has 2 divisors, whose sum is σ = 209355632640. Its totient is φ = 209355632638.

The previous prime is 209355632573. The next prime is 209355632659. The reversal of 209355632639 is 936236553902.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-209355632639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209355632659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104677816319 + 104677816320.

It is an arithmetic number, because the mean of its divisors is an integer number (104677816320).

Almost surely, 2^209355632639 is an apocalyptic number.

209355632639 is a deficient number, since it is larger than the sum of its proper divisors (1).

209355632639 is an equidigital number, since it uses as much as digits as its factorization.

209355632639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7873200, while the sum is 53.

The spelling of 209355632639 in words is "two hundred nine billion, three hundred fifty-five million, six hundred thirty-two thousand, six hundred thirty-nine".