6556661105 has 4 divisors (see below), whose sum is σ = 7867993332. Its totient is φ = 5245328880.

The previous prime is 6556661101. The next prime is 6556661171. The reversal of 6556661105 is 5011666556.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1010731264 + 5545929841 = 31792^2 + 74471^2 .

It is not a de Polignac number, because 6556661105 - 2² = 6556661101 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6556661101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 655666106 + ... + 655666115.

It is an arithmetic number, because the mean of its divisors is an integer number (1966998333).

Almost surely, 2^6556661105 is an apocalyptic number.

It is an amenable number.

6556661105 is a deficient number, since it is larger than the sum of its proper divisors (1311332227).

6556661105 is a wasteful number, since it uses less digits than its factorization.

6556661105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1311332226.

The product of its (nonzero) digits is 162000, while the sum is 41.

The square root of 6556661105 is about 80973.2122680087. The cubic root of 6556661105 is about 1871.6626718602.

The spelling of 6556661105 in words is "six billion, five hundred fifty-six million, six hundred sixty-one thousand, one hundred five".