6656661011 has 16 divisors (see below), whose sum is σ = 8937616128. Its totient is φ = 4788007200.

The previous prime is 6656660999. The next prime is 6656661023. The reversal of 6656661011 is 1101666566.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (6656660999) and next prime (6656661023).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6656661011 is a prime.

It is a super-2 number, since 2×6656661011² = 88622271630735084242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6656661041) 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, 3324005 + ... + 3326006.

It is an arithmetic number, because the mean of its divisors is an integer number (558601008).

Almost surely, 2^6656661011 is an apocalyptic number.

6656661011 is a deficient number, since it is larger than the sum of its proper divisors (2280955117).

6656661011 is a wasteful number, since it uses less digits than its factorization.

6656661011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6650042.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 6656661011 is about 81588.3632082419. The cubic root of 6656661011 is about 1881.1300180710.

The spelling of 6656661011 in words is "six billion, six hundred fifty-six million, six hundred sixty-one thousand, eleven".