87843917965 has 36 divisors (see below), whose sum is σ = 109622729916. Its totient is φ = 67569610752.

The previous prime is 87843917939. The next prime is 87843917989. The reversal of 87843917965 is 56971934878.

It can be written as a sum of positive squares in 18 ways, for example, as 59506235721 + 28337682244 = 243939^2 + 168338^2 .

It is not a de Polignac number, because 87843917965 - 2⁵ = 87843917933 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 87843917965.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 260664277 + ... + 260664613.

It is an arithmetic number, because the mean of its divisors is an integer number (3045075831).

Almost surely, 2^87843917965 is an apocalyptic number.

It is an amenable number.

87843917965 is a deficient number, since it is larger than the sum of its proper divisors (21778811951).

87843917965 is an equidigital number, since it uses as much as digits as its factorization.

87843917965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 866 (or 492 counting only the distinct ones).

The product of its digits is 91445760, while the sum is 67.

The spelling of 87843917965 in words is "eighty-seven billion, eight hundred forty-three million, nine hundred seventeen thousand, nine hundred sixty-five".