985855656690 has 160 divisors (see below), whose sum is σ = 2753149512960. Its totient is φ = 252939718656.

The previous prime is 985855656671. The next prime is 985855656697. The reversal of 985855656690 is 96656558589.

985855656690 is a `hidden beast` number, since 9 + 8 + 5 + 8 + 5 + 56 + 566 + 9 + 0 = 666.

It is a super-2 number, since 2×985855656690² (a number of 25 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (72) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (985855656697) by changing a digit.

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 79 ways as a sum of consecutive naturals, for example, 2026674 + ... + 2465586.

It is an arithmetic number, because the mean of its divisors is an integer number (17207184456).

Almost surely, 2^985855656690 is an apocalyptic number.

985855656690 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 985855656690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1376574756480).

985855656690 is an abundant number, since it is smaller than the sum of its proper divisors (1767293856270).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

985855656690 is a wasteful number, since it uses less digits than its factorization.

985855656690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439038 (or 439029 counting only the distinct ones).

The product of its (nonzero) digits is 699840000, while the sum is 72.

The spelling of 985855656690 in words is "nine hundred eighty-five billion, eight hundred fifty-five million, six hundred fifty-six thousand, six hundred ninety".