9660505921 has 4 divisors (see below), whose sum is σ = 10538733744. Its totient is φ = 8782278100.

The previous prime is 9660505919. The next prime is 9660505927. The reversal of 9660505921 is 1295050669.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 9660505921 - 2¹ = 9660505919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (9660505927) 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, 439113895 + ... + 439113916.

It is an arithmetic number, because the mean of its divisors is an integer number (2634683436).

Almost surely, 2^9660505921 is an apocalyptic number.

It is an amenable number.

9660505921 is a deficient number, since it is larger than the sum of its proper divisors (878227823).

9660505921 is a wasteful number, since it uses less digits than its factorization.

9660505921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 878227822.

The product of its (nonzero) digits is 145800, while the sum is 43.

The square root of 9660505921 is about 98287.8727056395. The cubic root of 9660505921 is about 2129.7728692398.

The spelling of 9660505921 in words is "nine billion, six hundred sixty million, five hundred five thousand, nine hundred twenty-one".