9660653861 has 8 divisors (see below), whose sum is σ = 9926079864. Its totient is φ = 9395455680.

The previous prime is 9660653857. The next prime is 9660653881. The reversal of 9660653861 is 1683560669.

It can be written as a sum of positive squares in 4 ways, for example, as 1323868225 + 8336785636 = 36385^2 + 91306^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9660653861 - 2² = 9660653857 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9660653881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30851 + ... + 142383.

It is an arithmetic number, because the mean of its divisors is an integer number (1240759983).

Almost surely, 2^9660653861 is an apocalyptic number.

It is an amenable number.

9660653861 is a deficient number, since it is larger than the sum of its proper divisors (265426003).

9660653861 is a wasteful number, since it uses less digits than its factorization.

9660653861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113911.

The product of its (nonzero) digits is 1399680, while the sum is 50.

The square root of 9660653861 is about 98288.6252879752. The cubic root of 9660653861 is about 2129.7837408923.

The spelling of 9660653861 in words is "nine billion, six hundred sixty million, six hundred fifty-three thousand, eight hundred sixty-one".