661326323623166 has 8 divisors (see below), whose sum is σ = 992888841272544. Its totient is φ = 330363376532320.

The previous prime is 661326323623129. The next prime is 661326323623187.

661326323623166 is nontrivially palindromic in base 10.

661326323623166 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 149892636875 + ... + 149892641286.

It is an arithmetic number, because the mean of its divisors is an integer number (124111105159068).

Almost surely, 2^{661326323623166} is an apocalyptic number.

661326323623166 is a deficient number, since it is larger than the sum of its proper divisors (331562517649378).

661326323623166 is a wasteful number, since it uses less digits than its factorization.

661326323623166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299785279266.

The product of its digits is 30233088, while the sum is 56.

The spelling of 661326323623166 in words is "six hundred sixty-one trillion, three hundred twenty-six billion, three hundred twenty-three million, six hundred twenty-three thousand, one hundred sixty-six".