985956408865 has 4 divisors (see below), whose sum is σ = 1183147690644. Its totient is φ = 788765127088.

The previous prime is 985956408817. The next prime is 985956408881. The reversal of 985956408865 is 568804659589.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 568804659589 = 1949 ⋅291844361.

It can be written as a sum of positive squares in 2 ways, for example, as 203502938769 + 782453470096 = 451113^2 + 884564^2 .

It is a cyclic number.

It is not a de Polignac number, because 985956408865 - 2¹¹ = 985956406817 is a prime.

It is a super-2 number, since 2×985956408865² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98595640882 + ... + 98595640891.

It is an arithmetic number, because the mean of its divisors is an integer number (295786922661).

Almost surely, 2^985956408865 is an apocalyptic number.

It is an amenable number.

985956408865 is a deficient number, since it is larger than the sum of its proper divisors (197191281779).

985956408865 is a wasteful number, since it uses less digits than its factorization.

985956408865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197191281778.

The product of its (nonzero) digits is 746496000, while the sum is 73.

The spelling of 985956408865 in words is "nine hundred eighty-five billion, nine hundred fifty-six million, four hundred eight thousand, eight hundred sixty-five".