40566643666 has 16 divisors (see below), whose sum is σ = 62164183680. Its totient is φ = 19845520560.

The previous prime is 40566643661. The next prime is 40566643693. The reversal of 40566643666 is 66634666504.

It is not an unprimeable number, because it can be changed into a prime (40566643661) 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, 240136 + ... + 372556.

It is an arithmetic number, because the mean of its divisors is an integer number (3885261480).

Almost surely, 2^40566643666 is an apocalyptic number.

40566643666 is a deficient number, since it is larger than the sum of its proper divisors (21597540014).

40566643666 is a wasteful number, since it uses less digits than its factorization.

40566643666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135729.

The product of its (nonzero) digits is 11197440, while the sum is 52.

The spelling of 40566643666 in words is "forty billion, five hundred sixty-six million, six hundred forty-three thousand, six hundred sixty-six".