9649566589 has 16 divisors (see below), whose sum is σ = 10692159408. Its totient is φ = 8650755072.

The previous prime is 9649566559. The next prime is 9649566593. The reversal of 9649566589 is 9856659469.

It can be written as a sum of positive squares in 8 ways, for example, as 383964025 + 9265602564 = 19595^2 + 96258^2 .

It is a cyclic number.

It is not a de Polignac number, because 9649566589 - 2⁹ = 9649566077 is a prime.

It is a super-2 number, since 2×9649566589² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9649566559) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 249909 + ... + 285925.

It is an arithmetic number, because the mean of its divisors is an integer number (668259963).

Almost surely, 2^9649566589 is an apocalyptic number.

It is an amenable number.

9649566589 is a deficient number, since it is larger than the sum of its proper divisors (1042592819).

9649566589 is a wasteful number, since it uses less digits than its factorization.

9649566589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36624.

The product of its digits is 125971200, while the sum is 67.

The square root of 9649566589 is about 98232.2074932657. The cubic root of 9649566589 is about 2128.9686638708.

The spelling of 9649566589 in words is "nine billion, six hundred forty-nine million, five hundred sixty-six thousand, five hundred eighty-nine".