66281740066 has 16 divisors (see below), whose sum is σ = 100965629304. Its totient is φ = 32628161664.

The previous prime is 66281740051. The next prime is 66281740067. The reversal of 66281740066 is 66004718266.

It can be written as a sum of positive squares in 4 ways, for example, as 60051953025 + 6229787041 = 245055^2 + 78929^2 .

It is a junction number, because it is equal to n+sod(n) for n = 66281739998 and 66281740025.

It is not an unprimeable number, because it can be changed into a prime (66281740067) 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, 326205 + ... + 488848.

Almost surely, 2^66281740066 is an apocalyptic number.

66281740066 is a deficient number, since it is larger than the sum of its proper divisors (34683889238).

66281740066 is a wasteful number, since it uses less digits than its factorization.

66281740066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 815685.

The product of its (nonzero) digits is 580608, while the sum is 46.

The spelling of 66281740066 in words is "sixty-six billion, two hundred eighty-one million, seven hundred forty thousand, sixty-six".