7985784975668 has 6 divisors (see below), whose sum is σ = 13975123707426. Its totient is φ = 3992892487832.

The previous prime is 7985784975659. The next prime is 7985784975671. The reversal of 7985784975668 is 8665794875897.

It can be written as a sum of positive squares in only one way, i.e., 6119943717904 + 1865841257764 = 2473852^2 + 1365958^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 998223121955 + ... + 998223121962.

It is an arithmetic number, because the mean of its divisors is an integer number (2329187284571).

Almost surely, 2^{7985784975668} is an apocalyptic number.

It is an amenable number.

7985784975668 is a deficient number, since it is larger than the sum of its proper divisors (5989338731758).

7985784975668 is a wasteful number, since it uses less digits than its factorization.

7985784975668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1996446243921 (or 1996446243919 counting only the distinct ones).

The product of its digits is 51209625600, while the sum is 89.

The spelling of 7985784975668 in words is "seven trillion, nine hundred eighty-five billion, seven hundred eighty-four million, nine hundred seventy-five thousand, six hundred sixty-eight".