6656756899 has 16 divisors (see below), whose sum is σ = 7486617600. Its totient is φ = 5872733856.

The previous prime is 6656756879. The next prime is 6656756903. The reversal of 6656756899 is 9986576566.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 6656756899 - 2¹¹ = 6656754851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6656756819) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 385942 + ... + 402820.

It is an arithmetic number, because the mean of its divisors is an integer number (467913600).

Almost surely, 2^6656756899 is an apocalyptic number.

6656756899 is a deficient number, since it is larger than the sum of its proper divisors (829860701).

6656756899 is a wasteful number, since it uses less digits than its factorization.

6656756899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18234.

The product of its digits is 146966400, while the sum is 67.

The square root of 6656756899 is about 81588.9508389463. The cubic root of 6656756899 is about 1881.1390504737.

The spelling of 6656756899 in words is "six billion, six hundred fifty-six million, seven hundred fifty-six thousand, eight hundred ninety-nine".