661274141472166 has 16 divisors (see below), whose sum is σ = 997647867939168. Its totient is φ = 328724863902400.

The previous prime is 661274141472143. The next prime is 661274141472277.

It is a happy number.

661274141472166 is nontrivially palindromic in base 10.

661274141472166 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 661274141472166.

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, 116912031 + ... + 122437621.

It is an arithmetic number, because the mean of its divisors is an integer number (62352991746198).

Almost surely, 2^{661274141472166} is an apocalyptic number.

661274141472166 is a deficient number, since it is larger than the sum of its proper divisors (336373726467002).

661274141472166 is a wasteful number, since it uses less digits than its factorization.

661274141472166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5871647.

The product of its digits is 16257024, while the sum is 58.

The spelling of 661274141472166 in words is "six hundred sixty-one trillion, two hundred seventy-four billion, one hundred forty-one million, four hundred seventy-two thousand, one hundred sixty-six".