6600011565561 has 16 divisors (see below), whose sum is σ = 9110366179200. Its totient is φ = 4245062396288.

The previous prime is 6600011565509. The next prime is 6600011565607. The reversal of 6600011565561 is 1655651100066.

It is a cyclic number.

It is not a de Polignac number, because 6600011565561 - 2²³ = 6600003176953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6600011565061) 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, 28642716 + ... + 28872221.

It is an arithmetic number, because the mean of its divisors is an integer number (569397886200).

Almost surely, 2^{6600011565561} is an apocalyptic number.

It is an amenable number.

6600011565561 is a deficient number, since it is larger than the sum of its proper divisors (2510354613639).

6600011565561 is a wasteful number, since it uses less digits than its factorization.

6600011565561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57516288.

The product of its (nonzero) digits is 162000, while the sum is 42.

The spelling of 6600011565561 in words is "six trillion, six hundred billion, eleven million, five hundred sixty-five thousand, five hundred sixty-one".