8809650689661 has 6 divisors (see below), whose sum is σ = 12725050996190. Its totient is φ = 5873100459768.

The previous prime is 8809650689659. The next prime is 8809650689677. The reversal of 8809650689661 is 1669860569088.

It can be written as a sum of positive squares in only one way, i.e., 8516655825561 + 292994864100 = 2918331^2 + 541290^2 .

It is not a de Polignac number, because 8809650689661 - 2¹ = 8809650689659 is a prime.

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 8809650689661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8809650689621) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 489425038306 + ... + 489425038323.

Almost surely, 2^{8809650689661} is an apocalyptic number.

It is an amenable number.

8809650689661 is a deficient number, since it is larger than the sum of its proper divisors (3915400306529).

8809650689661 is a wasteful number, since it uses less digits than its factorization.

8809650689661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 978850076635 (or 978850076632 counting only the distinct ones).

The product of its (nonzero) digits is 268738560, while the sum is 72.

The spelling of 8809650689661 in words is "eight trillion, eight hundred nine billion, six hundred fifty million, six hundred eighty-nine thousand, six hundred sixty-one".