8506066721 has 8 divisors (see below), whose sum is σ = 8690436864. Its totient is φ = 8321837920.

The previous prime is 8506066697. The next prime is 8506066727. The reversal of 8506066721 is 1276606058.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8506066721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8506066727) 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, 91181 + ... + 159141.

It is an arithmetic number, because the mean of its divisors is an integer number (1086304608).

Almost surely, 2^8506066721 is an apocalyptic number.

It is an amenable number.

8506066721 is a deficient number, since it is larger than the sum of its proper divisors (184370143).

8506066721 is a wasteful number, since it uses less digits than its factorization.

8506066721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70671.

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 8506066721 is about 92228.3401184256. The cubic root of 8506066721 is about 2041.3129700538.

The spelling of 8506066721 in words is "eight billion, five hundred six million, sixty-six thousand, seven hundred twenty-one".