166323323661 has 16 divisors (see below), whose sum is σ = 242242774848. Its totient is φ = 100669539200.

The previous prime is 166323323651. The next prime is 166323323693.

It is a happy number.

166323323661 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 166323323661 - 2²² = 166319129357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166323323611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3286386 + ... + 3336611.

It is an arithmetic number, because the mean of its divisors is an integer number (15140173428).

Almost surely, 2^166323323661 is an apocalyptic number.

166323323661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

166323323661 is a deficient number, since it is larger than the sum of its proper divisors (75919451187).

166323323661 is a wasteful number, since it uses less digits than its factorization.

166323323661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6623772.

The product of its digits is 419904, while the sum is 42.

It can be divided in two parts, 166323 and 323661, that added together give a palindrome (489984).

The spelling of 166323323661 in words is "one hundred sixty-six billion, three hundred twenty-three million, three hundred twenty-three thousand, six hundred sixty-one".