1666762676661 has 32 divisors (see below), whose sum is σ = 2371289644800. Its totient is φ = 1037731595264.

The previous prime is 1666762676597. The next prime is 1666762676671.

It is a happy number.

1666762676661 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 1666762676661 - 2⁶ = 1666762676597 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1666762676592 and 1666762676601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666762676671) 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 31 ways as a sum of consecutive naturals, for example, 7358251 + ... + 7581383.

It is an arithmetic number, because the mean of its divisors is an integer number (74102801400).

Almost surely, 2^{1666762676661} is an apocalyptic number.

It is an amenable number.

1666762676661 is a deficient number, since it is larger than the sum of its proper divisors (704526968139).

1666762676661 is a wasteful number, since it uses less digits than its factorization.

1666762676661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224285.

The product of its digits is 164602368, while the sum is 66.

The spelling of 1666762676661 in words is "one trillion, six hundred sixty-six billion, seven hundred sixty-two million, six hundred seventy-six thousand, six hundred sixty-one".