661641202146166 has 24 divisors (see below), whose sum is σ = 1097193476881152. Its totient is φ = 299007584766000.

The previous prime is 661641202146107. The next prime is 661641202146269.

661641202146166 is nontrivially palindromic in base 10.

661641202146166 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 an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7901849910 + ... + 7901933641.

It is an arithmetic number, because the mean of its divisors is an integer number (45716394870048).

Almost surely, 2^{661641202146166} is an apocalyptic number.

661641202146166 is a deficient number, since it is larger than the sum of its proper divisors (435552274734986).

661641202146166 is a wasteful number, since it uses less digits than its factorization.

661641202146166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15803783748 (or 15803783737 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 52.

The spelling of 661641202146166 in words is "six hundred sixty-one trillion, six hundred forty-one billion, two hundred two million, one hundred forty-six thousand, one hundred sixty-six".