8991066071 has 4 divisors (see below), whose sum is σ = 9682686552. Its totient is φ = 8299445592.

The previous prime is 8991066053. The next prime is 8991066089. The reversal of 8991066071 is 1706601998.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (8991066053) and next prime (8991066089).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8991066071 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 (8991066031) 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, 345810221 + ... + 345810246.

It is an arithmetic number, because the mean of its divisors is an integer number (2420671638).

Almost surely, 2^8991066071 is an apocalyptic number.

8991066071 is a deficient number, since it is larger than the sum of its proper divisors (691620481).

8991066071 is a wasteful number, since it uses less digits than its factorization.

8991066071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 691620480.

The product of its (nonzero) digits is 163296, while the sum is 47.

The square root of 8991066071 is about 94821.2321740231. The cubic root of 8991066071 is about 2079.3953240316.

The spelling of 8991066071 in words is "eight billion, nine hundred ninety-one million, sixty-six thousand, seventy-one".