66611050665 has 16 divisors (see below), whose sum is σ = 106618406976. Its totient is φ = 35512318400.

The previous prime is 66611050663. The next prime is 66611050699. The reversal of 66611050665 is 56605011666.

It is not a de Polignac number, because 66611050665 - 2¹ = 66611050663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66611050663) 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, 807831 + ... + 886460.

It is an arithmetic number, because the mean of its divisors is an integer number (6663650436).

Almost surely, 2^66611050665 is an apocalyptic number.

It is an amenable number.

66611050665 is a deficient number, since it is larger than the sum of its proper divisors (40007356311).

66611050665 is a wasteful number, since it uses less digits than its factorization.

66611050665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1696920.

The product of its (nonzero) digits is 194400, while the sum is 42.

The spelling of 66611050665 in words is "sixty-six billion, six hundred eleven million, fifty thousand, six hundred sixty-five".