985021851265 has 4 divisors (see below), whose sum is σ = 1182026221524. Its totient is φ = 788017481008.

The previous prime is 985021851239. The next prime is 985021851283. The reversal of 985021851265 is 562158120589.

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 697386999409 + 287634851856 = 835097^2 + 536316^2 .

It is a cyclic number.

It is not a de Polignac number, because 985021851265 - 2¹³ = 985021843073 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98502185122 + ... + 98502185131.

It is an arithmetic number, because the mean of its divisors is an integer number (295506555381).

Almost surely, 2^985021851265 is an apocalyptic number.

It is an amenable number.

985021851265 is a deficient number, since it is larger than the sum of its proper divisors (197004370259).

985021851265 is a wasteful number, since it uses less digits than its factorization.

985021851265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197004370258.

The product of its (nonzero) digits is 1728000, while the sum is 52.

The spelling of 985021851265 in words is "nine hundred eighty-five billion, twenty-one million, eight hundred fifty-one thousand, two hundred sixty-five".