7985957866 has 16 divisors (see below), whose sum is σ = 12093382656. Its totient is φ = 3954935376.

The previous prime is 7985957851. The next prime is 7985957873. The reversal of 7985957866 is 6687595897.

It is a junction number, because it is equal to n+sod(n) for n = 7985957795 and 7985957804.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128280 + ... + 180076.

It is an arithmetic number, because the mean of its divisors is an integer number (755836416).

Almost surely, 2^7985957866 is an apocalyptic number.

7985957866 is a deficient number, since it is larger than the sum of its proper divisors (4107424790).

7985957866 is a wasteful number, since it uses less digits than its factorization.

7985957866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52533.

The product of its digits is 228614400, while the sum is 70.

The square root of 7985957866 is about 89364.1867080991. The cubic root of 7985957866 is about 1998.8291368402.

The spelling of 7985957866 in words is "seven billion, nine hundred eighty-five million, nine hundred fifty-seven thousand, eight hundred sixty-six".