9491521660271 has 12 divisors (see below), whose sum is σ = 11051259611832. Its totient is φ = 8128146590928.

The previous prime is 9491521660223. The next prime is 9491521660301. The reversal of 9491521660271 is 1720661251949.

It is not a de Polignac number, because 9491521660271 - 2¹⁰ = 9491521659247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9491521660171) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 88557845 + ... + 88664958.

It is an arithmetic number, because the mean of its divisors is an integer number (920938300986).

Almost surely, 2^{9491521660271} is an apocalyptic number.

9491521660271 is a deficient number, since it is larger than the sum of its proper divisors (1559737951561).

9491521660271 is a wasteful number, since it uses less digits than its factorization.

9491521660271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177223910 (or 177223903 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 53.

The spelling of 9491521660271 in words is "nine trillion, four hundred ninety-one billion, five hundred twenty-one million, six hundred sixty thousand, two hundred seventy-one".