661214412166 has 32 divisors (see below), whose sum is σ = 1236605771520. Its totient is φ = 257605807200.

The previous prime is 661214412143. The next prime is 661214412167.

It is a happy number.

661214412166 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661214412167) 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 15 ways as a sum of consecutive naturals, for example, 4684281 + ... + 4823371.

It is an arithmetic number, because the mean of its divisors is an integer number (38643930360).

Almost surely, 2^661214412166 is an apocalyptic number.

661214412166 is a deficient number, since it is larger than the sum of its proper divisors (575391359354).

661214412166 is a wasteful number, since it uses less digits than its factorization.

661214412166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169980.

The product of its digits is 82944, while the sum is 40.

The spelling of 661214412166 in words is "six hundred sixty-one billion, two hundred fourteen million, four hundred twelve thousand, one hundred sixty-six".