7899643016 has 16 divisors (see below), whose sum is σ = 14812796700. Its totient is φ = 3949563904.

The previous prime is 7899642991. The next prime is 7899643019. The reversal of 7899643016 is 6103469987.

It can be written as a sum of positive squares in 2 ways, for example, as 6471558916 + 1428084100 = 80446^2 + 37790^2 .

It is not an unprimeable number, because it can be changed into a prime (7899643019) 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 3 ways as a sum of consecutive naturals, for example, 181736 + ... + 220968.

Almost surely, 2^7899643016 is an apocalyptic number.

It is an amenable number.

7899643016 is a deficient number, since it is larger than the sum of its proper divisors (6913153684).

7899643016 is a wasteful number, since it uses less digits than its factorization.

7899643016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64408 (or 64404 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 53.

The square root of 7899643016 is about 88879.9359585728. The cubic root of 7899643016 is about 1991.6017016544.

The spelling of 7899643016 in words is "seven billion, eight hundred ninety-nine million, six hundred forty-three thousand, sixteen".