66741550665 has 16 divisors (see below), whose sum is σ = 106791048000. Its totient is φ = 35593971392.

The previous prime is 66741550661. The next prime is 66741550691. The reversal of 66741550665 is 56605514766.

It is a cyclic number.

It is not a de Polignac number, because 66741550665 - 2² = 66741550661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66741550661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 327991 + ... + 490979.

It is an arithmetic number, because the mean of its divisors is an integer number (6674440500).

Almost surely, 2^66741550665 is an apocalyptic number.

It is an amenable number.

66741550665 is a deficient number, since it is larger than the sum of its proper divisors (40049497335).

66741550665 is a wasteful number, since it uses less digits than its factorization.

66741550665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190296.

The product of its (nonzero) digits is 4536000, while the sum is 51.

The spelling of 66741550665 in words is "sixty-six billion, seven hundred forty-one million, five hundred fifty thousand, six hundred sixty-five".