209135505408 has 208 divisors, whose sum is σ = 579112873920. Its totient is φ = 67044769792.

The previous prime is 209135505391. The next prime is 209135505419. The reversal of 209135505408 is 804505531902.

It is a self number, because there is not a number n which added to its sum of digits gives 209135505408.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104410135 + ... + 104412137.

Almost surely, 2^209135505408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 209135505408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (289556436960).

209135505408 is an abundant number, since it is smaller than the sum of its proper divisors (369977368512).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

209135505408 is a wasteful number, since it uses less digits than its factorization.

209135505408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2352 (or 2330 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 42.

The spelling of 209135505408 in words is "two hundred nine billion, one hundred thirty-five million, five hundred five thousand, four hundred eight".