666565616050 has 48 divisors (see below), whose sum is σ = 1270186738560. Its totient is φ = 260129860160.

The previous prime is 666565616021. The next prime is 666565616051. The reversal of 666565616050 is 50616565666.

It is not an unprimeable number, because it can be changed into a prime (666565616051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 297561 + ... + 1192339.

It is an arithmetic number, because the mean of its divisors is an integer number (26462223720).

Almost surely, 2^666565616050 is an apocalyptic number.

666565616050 is a deficient number, since it is larger than the sum of its proper divisors (603621122510).

666565616050 is a wasteful number, since it uses less digits than its factorization.

666565616050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 895155 (or 895150 counting only the distinct ones).

The product of its (nonzero) digits is 5832000, while the sum is 52.

The spelling of 666565616050 in words is "six hundred sixty-six billion, five hundred sixty-five million, six hundred sixteen thousand, fifty".