871901985065 has 12 divisors (see below), whose sum is σ = 1063715758092. Its totient is φ = 686086793280.

The previous prime is 871901985041. The next prime is 871901985077. The reversal of 871901985065 is 560589109178.

It can be written as a sum of positive squares in 6 ways, for example, as 368070329344 + 503831655721 = 606688^2 + 709811^2 .

It is a de Polignac number, because none of the positive numbers 2^k-871901985065 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 871901984995 and 871901985013.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23413322 + ... + 23450531.

It is an arithmetic number, because the mean of its divisors is an integer number (88642979841).

Almost surely, 2^871901985065 is an apocalyptic number.

It is an amenable number.

871901985065 is a deficient number, since it is larger than the sum of its proper divisors (191813773027).

871901985065 is an equidigital number, since it uses as much as digits as its factorization.

871901985065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46863980 (or 46863919 counting only the distinct ones).

The product of its (nonzero) digits is 5443200, while the sum is 59.

The spelling of 871901985065 in words is "eight hundred seventy-one billion, nine hundred one million, nine hundred eighty-five thousand, sixty-five".