61666006506616 has 24 divisors (see below), whose sum is σ = 122825242203120. Its totient is φ = 29019297178496.

The previous prime is 61666006506613. The next prime is 61666006506647. The reversal of 61666006506616 is 61660560066616.

61666006506616 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61666006506613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13336071760 + ... + 13336076383.

It is an arithmetic number, because the mean of its divisors is an integer number (5117718425130).

Almost surely, 2^{61666006506616} is an apocalyptic number.

It is an amenable number.

61666006506616 is a deficient number, since it is larger than the sum of its proper divisors (61159235696504).

61666006506616 is a wasteful number, since it uses less digits than its factorization.

61666006506616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26672148183 (or 26672148162 counting only the distinct ones).

The product of its (nonzero) digits is 8398080, while the sum is 55.

Subtracting from 61666006506616 its reverse (61660560066616), we obtain a square (5446440000 = 73800²).

The spelling of 61666006506616 in words is "sixty-one trillion, six hundred sixty-six billion, six million, five hundred six thousand, six hundred sixteen".