208289669969 has 8 divisors (see below), whose sum is σ = 212282987112. Its totient is φ = 204298698240.

The previous prime is 208289669923. The next prime is 208289669981. The reversal of 208289669969 is 969966982802.

It can be written as a sum of positive squares in 4 ways, for example, as 52688611600 + 155601058369 = 229540^2 + 394463^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 208289669969 - 2¹⁶ = 208289604433 is a prime.

It is a super-2 number, since 2×208289669969² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 208289669896 and 208289669905.

It is not an unprimeable number, because it can be changed into a prime (208289669909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 406514 + ... + 762779.

It is an arithmetic number, because the mean of its divisors is an integer number (26535373389).

Almost surely, 2^208289669969 is an apocalyptic number.

It is an amenable number.

208289669969 is a deficient number, since it is larger than the sum of its proper divisors (3993317143).

208289669969 is a wasteful number, since it uses less digits than its factorization.

208289669969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1172707.

The product of its (nonzero) digits is 362797056, while the sum is 74.

The spelling of 208289669969 in words is "two hundred eight billion, two hundred eighty-nine million, six hundred sixty-nine thousand, nine hundred sixty-nine".