8664951689641 has 9 divisors (see below), whose sum is σ = 9382799775909. Its totient is φ = 7998381620736.

The previous prime is 8664951689621. The next prime is 8664951689677. The reversal of 8664951689641 is 1469861594668.

The square root of 8664951689641 is 2943629.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 265040662041 + 8399911027600 = 514821^2 + 2898260^2 .

It is not a de Polignac number, because 8664951689641 - 2¹¹ = 8664951687593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8664951689621) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 38153961 + ... + 38380393.

Almost surely, 2^{8664951689641} is an apocalyptic number.

8664951689641 is the 2943629-th square number.

8664951689641 is the 1471815-th centered octagonal number.

It is an amenable number.

8664951689641 is a deficient number, since it is larger than the sum of its proper divisors (717848086268).

8664951689641 is an frugal number, since it uses more digits than its factorization.

8664951689641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452892 (or 226446 counting only the distinct ones).

The product of its digits is 537477120, while the sum is 73.

The spelling of 8664951689641 in words is "eight trillion, six hundred sixty-four billion, nine hundred fifty-one million, six hundred eighty-nine thousand, six hundred forty-one".