209625690889 has 12 divisors (see below), whose sum is σ = 214903063408. Its totient is φ = 204474944160.

The previous prime is 209625690853. The next prime is 209625690913. The reversal of 209625690889 is 988096526902.

It is not a de Polignac number, because 209625690889 - 2⁷ = 209625690761 is a prime.

It is a super-2 number, since 2×209625690889² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 209625690889.

It is not an unprimeable number, because it can be changed into a prime (209625690689) 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 11 ways as a sum of consecutive naturals, for example, 14387122 + ... + 14401684.

Almost surely, 2^209625690889 is an apocalyptic number.

It is an amenable number.

209625690889 is a deficient number, since it is larger than the sum of its proper divisors (5277372519).

209625690889 is an equidigital number, since it uses as much as digits as its factorization.

209625690889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23208 (or 23167 counting only the distinct ones).

The product of its (nonzero) digits is 33592320, while the sum is 64.

The spelling of 209625690889 in words is "two hundred nine billion, six hundred twenty-five million, six hundred ninety thousand, eight hundred eighty-nine".