9666264661 has 4 divisors (see below), whose sum is σ = 9765916972. Its totient is φ = 9566612352.

The previous prime is 9666264613. The next prime is 9666264697. The reversal of 9666264661 is 1664626669.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1664626669 = 83 ⋅20055743.

It can be written as a sum of positive squares in 2 ways, for example, as 6321840100 + 3344424561 = 79510^2 + 57831^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9666264661 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9666264599 and 9666264608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9666264961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49826010 + ... + 49826203.

It is an arithmetic number, because the mean of its divisors is an integer number (2441479243).

Almost surely, 2^9666264661 is an apocalyptic number.

It is an amenable number.

9666264661 is a deficient number, since it is larger than the sum of its proper divisors (99652311).

9666264661 is an equidigital number, since it uses as much as digits as its factorization.

9666264661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99652310.

The product of its digits is 3359232, while the sum is 52.

The square root of 9666264661 is about 98317.1636134810. The cubic root of 9666264661 is about 2130.1959793079.

The spelling of 9666264661 in words is "nine billion, six hundred sixty-six million, two hundred sixty-four thousand, six hundred sixty-one".