661363585363166 has 16 divisors (see below), whose sum is σ = 1133771412677856. Its totient is φ = 283440219998976.

The previous prime is 661363585363157. The next prime is 661363585363171.

It is a happy number.

661363585363166 is nontrivially palindromic in base 10.

661363585363166 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 661363585363096 and 661363585363105.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106590731 + ... + 112624646.

It is an arithmetic number, because the mean of its divisors is an integer number (70860713292366).

Almost surely, 2^{661363585363166} is an apocalyptic number.

661363585363166 is a deficient number, since it is larger than the sum of its proper divisors (472407827314690).

661363585363166 is a wasteful number, since it uses less digits than its factorization.

661363585363166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219430883.

The product of its digits is 755827200, while the sum is 68.

The spelling of 661363585363166 in words is "six hundred sixty-one trillion, three hundred sixty-three billion, five hundred eighty-five million, three hundred sixty-three thousand, one hundred sixty-six".