6661533669 has 32 divisors (see below), whose sum is σ = 10289664000. Its totient is φ = 3754655424.

The previous prime is 6661533649. The next prime is 6661533713. The reversal of 6661533669 is 9663351666.

It is not a de Polignac number, because 6661533669 - 2⁹ = 6661533157 is a prime.

It is a super-2 number, since 2×6661533669² = 88752061646441203122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6661533629) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3282147 + ... + 3284175.

It is an arithmetic number, because the mean of its divisors is an integer number (321552000).

Almost surely, 2^6661533669 is an apocalyptic number.

It is an amenable number.

6661533669 is a deficient number, since it is larger than the sum of its proper divisors (3628130331).

6661533669 is a wasteful number, since it uses less digits than its factorization.

6661533669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4097.

The product of its digits is 3149280, while the sum is 51.

The square root of 6661533669 is about 81618.2189771377. The cubic root of 6661533669 is about 1881.5889001644.

The spelling of 6661533669 in words is "six billion, six hundred sixty-one million, five hundred thirty-three thousand, six hundred sixty-nine".