851021164448717 has 8 divisors (see below), whose sum is σ = 855016986536256. Its totient is φ = 847027507538592.

The previous prime is 851021164448713. The next prime is 851021164448723. The reversal of 851021164448717 is 717844461120158.

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 851021164448717 - 2² = 851021164448713 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 (851021164448713) 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, 540506408 + ... + 542078609.

It is an arithmetic number, because the mean of its divisors is an integer number (106877123317032).

Almost surely, 2^{851021164448717} is an apocalyptic number.

It is an amenable number.

851021164448717 is a deficient number, since it is larger than the sum of its proper divisors (3995822087539).

851021164448717 is a wasteful number, since it uses less digits than its factorization.

851021164448717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1082588707.

The product of its (nonzero) digits is 12042240, while the sum is 59.

The spelling of 851021164448717 in words is "eight hundred fifty-one trillion, twenty-one billion, one hundred sixty-four million, four hundred forty-eight thousand, seven hundred seventeen".