6656915816 has 16 divisors (see below), whose sum is σ = 12485170500. Its totient is φ = 3327537024.

The previous prime is 6656915807. The next prime is 6656915843. The reversal of 6656915816 is 6185196566.

It can be written as a sum of positive squares in 2 ways, for example, as 4299424900 + 2357490916 = 65570^2 + 48554^2 .

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83891 + ... + 142658.

Almost surely, 2^6656915816 is an apocalyptic number.

It is an amenable number.

6656915816 is a deficient number, since it is larger than the sum of its proper divisors (5828254684).

6656915816 is a wasteful number, since it uses less digits than its factorization.

6656915816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230228 (or 230224 counting only the distinct ones).

The product of its digits is 2332800, while the sum is 53.

The square root of 6656915816 is about 81589.9247211321. The cubic root of 6656915816 is about 1881.1540198550.

The spelling of 6656915816 in words is "six billion, six hundred fifty-six million, nine hundred fifteen thousand, eight hundred sixteen".