661643346166 has 32 divisors (see below), whose sum is σ = 1112706144000. Its totient is φ = 292470000480.

The previous prime is 661643346131. The next prime is 661643346187.

661643346166 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1310466 + ... + 1743733.

It is an arithmetic number, because the mean of its divisors is an integer number (34772067000).

Almost surely, 2^661643346166 is an apocalyptic number.

661643346166 is a deficient number, since it is larger than the sum of its proper divisors (451062797834).

661643346166 is a wasteful number, since it uses less digits than its factorization.

661643346166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3054484.

The product of its digits is 6718464, while the sum is 52.

The spelling of 661643346166 in words is "six hundred sixty-one billion, six hundred forty-three million, three hundred forty-six thousand, one hundred sixty-six".