166677776661 has 16 divisors (see below), whose sum is σ = 243927774720. Its totient is φ = 100397095920.

The previous prime is 166677776641. The next prime is 166677776693.

166677776661 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 166677776661 - 2¹⁰ = 166677775637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 166677776592 and 166677776601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166677776641) 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, 15488001 + ... + 15498758.

It is an arithmetic number, because the mean of its divisors is an integer number (15245485920).

Almost surely, 2^166677776661 is an apocalyptic number.

166677776661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

166677776661 is a deficient number, since it is larger than the sum of its proper divisors (77249998059).

166677776661 is a wasteful number, since it uses less digits than its factorization.

166677776661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30986936.

The product of its digits is 112021056, while the sum is 66.

The spelling of 166677776661 in words is "one hundred sixty-six billion, six hundred seventy-seven million, seven hundred seventy-six thousand, six hundred sixty-one".