66565006665 has 32 divisors (see below), whose sum is σ = 107051656320. Its totient is φ = 35319031296.

The previous prime is 66565006663. The next prime is 66565006667. The reversal of 66565006665 is 56660056566.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (66565006663) and next prime (66565006667).

It is not a de Polignac number, because 66565006665 - 2¹ = 66565006663 is a prime.

It is a super-2 number, since 2×66565006665² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66565006663) 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, 4915594 + ... + 4929116.

It is an arithmetic number, because the mean of its divisors is an integer number (3345364260).

Almost surely, 2^66565006665 is an apocalyptic number.

It is an amenable number.

66565006665 is a deficient number, since it is larger than the sum of its proper divisors (40486649655).

66565006665 is a wasteful number, since it uses less digits than its factorization.

66565006665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15193.

The product of its (nonzero) digits is 5832000, while the sum is 51.

The spelling of 66565006665 in words is "sixty-six billion, five hundred sixty-five million, six thousand, six hundred sixty-five".