7911985166 has 4 divisors (see below), whose sum is σ = 11867977752. Its totient is φ = 3955992582.

The previous prime is 7911985153. The next prime is 7911985201. The reversal of 7911985166 is 6615891197.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6615891197 = 193 ⋅34279229.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1977996290 + ... + 1977996293.

It is an arithmetic number, because the mean of its divisors is an integer number (2966994438).

Almost surely, 2^7911985166 is an apocalyptic number.

7911985166 is a deficient number, since it is larger than the sum of its proper divisors (3955992586).

7911985166 is a wasteful number, since it uses less digits than its factorization.

7911985166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3955992585.

The product of its digits is 816480, while the sum is 53.

The square root of 7911985166 is about 88949.3404472456. The cubic root of 7911985166 is about 1992.6383669254.

The spelling of 7911985166 in words is "seven billion, nine hundred eleven million, nine hundred eighty-five thousand, one hundred sixty-six".