852021717881 has 4 divisors (see below), whose sum is σ = 861594995700. Its totient is φ = 842448440064.

The previous prime is 852021717863. The next prime is 852021717913. The reversal of 852021717881 is 188717120258.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 277791189481 + 574230528400 = 527059^2 + 757780^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-852021717881 is a prime.

It is a super-2 number, since 2×852021717881² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (852021717821) 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, 4786638776 + ... + 4786638953.

It is an arithmetic number, because the mean of its divisors is an integer number (215398748925).

Almost surely, 2^852021717881 is an apocalyptic number.

It is an amenable number.

852021717881 is a deficient number, since it is larger than the sum of its proper divisors (9573277819).

852021717881 is an equidigital number, since it uses as much as digits as its factorization.

852021717881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9573277818.

The product of its (nonzero) digits is 501760, while the sum is 50.

The spelling of 852021717881 in words is "eight hundred fifty-two billion, twenty-one million, seven hundred seventeen thousand, eight hundred eighty-one".