66411535665 has 32 divisors (see below), whose sum is σ = 107234346240. Its totient is φ = 35094398976.

The previous prime is 66411535649. The next prime is 66411535667. The reversal of 66411535665 is 56653511466.

It is not a de Polignac number, because 66411535665 - 2⁴ = 66411535649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66411535667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8062389 + ... + 8070621.

It is an arithmetic number, because the mean of its divisors is an integer number (3351073320).

Almost surely, 2^66411535665 is an apocalyptic number.

It is an amenable number.

66411535665 is a deficient number, since it is larger than the sum of its proper divisors (40822810575).

66411535665 is a wasteful number, since it uses less digits than its factorization.

66411535665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13113.

The product of its digits is 1944000, while the sum is 48.

The spelling of 66411535665 in words is "sixty-six billion, four hundred eleven million, five hundred thirty-five thousand, six hundred sixty-five".