66505131611 has 8 divisors (see below), whose sum is σ = 67628774400. Its totient is φ = 65388534120.

The previous prime is 66505131587. The next prime is 66505131613. The reversal of 66505131611 is 11613150566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66505131611 - 2³⁰ = 65431389787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66505131613) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1742285 + ... + 1780046.

It is an arithmetic number, because the mean of its divisors is an integer number (8453596800).

Almost surely, 2^66505131611 is an apocalyptic number.

66505131611 is a deficient number, since it is larger than the sum of its proper divisors (1123642789).

66505131611 is a wasteful number, since it uses less digits than its factorization.

66505131611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3522649.

The product of its (nonzero) digits is 16200, while the sum is 35.

The spelling of 66505131611 in words is "sixty-six billion, five hundred five million, one hundred thirty-one thousand, six hundred eleven".