61550606666 has 16 divisors (see below), whose sum is σ = 97269672960. Its totient is φ = 29130199200.

The previous prime is 61550606617. The next prime is 61550606681. The reversal of 61550606666 is 66660605516.

It is a self number, because there is not a number n which added to its sum of digits gives 61550606666.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 659891 + ... + 747366.

It is an arithmetic number, because the mean of its divisors is an integer number (6079354560).

Almost surely, 2^61550606666 is an apocalyptic number.

61550606666 is a deficient number, since it is larger than the sum of its proper divisors (35719066294).

61550606666 is a wasteful number, since it uses less digits than its factorization.

61550606666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1408429.

The product of its (nonzero) digits is 1166400, while the sum is 47.

The spelling of 61550606666 in words is "sixty-one billion, five hundred fifty million, six hundred six thousand, six hundred sixty-six".