61666056616 has 32 divisors (see below), whose sum is σ = 116822752200. Its totient is φ = 30513606400.

The previous prime is 61666056593. The next prime is 61666056629. The reversal of 61666056616 is 61665066616.

It can be written as a sum of positive squares in 4 ways, for example, as 57242476516 + 4423580100 = 239254^2 + 66510^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 61666056616.

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, 1849146 + ... + 1882198.

Almost surely, 2^61666056616 is an apocalyptic number.

It is an amenable number.

61666056616 is a deficient number, since it is larger than the sum of its proper divisors (55156695584).

61666056616 is a wasteful number, since it uses less digits than its factorization.

61666056616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35469 (or 35465 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 49.

The spelling of 61666056616 in words is "sixty-one billion, six hundred sixty-six million, fifty-six thousand, six hundred sixteen".