809617601616 has 20 divisors (see below), whose sum is σ = 2091512137632. Its totient is φ = 269872533856.

The previous prime is 809617601603. The next prime is 809617601627. The reversal of 809617601616 is 616106716908.

It is a super-2 number, since 2×809617601616² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8433516636 + ... + 8433516731.

Almost surely, 2^809617601616 is an apocalyptic number.

It is an amenable number.

809617601616 is an abundant number, since it is smaller than the sum of its proper divisors (1281894536016).

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

809617601616 is a wasteful number, since it uses less digits than its factorization.

809617601616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16867033378 (or 16867033372 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 51.

The spelling of 809617601616 in words is "eight hundred nine billion, six hundred seventeen million, six hundred one thousand, six hundred sixteen".