1667016666687 has 4 divisors (see below), whose sum is σ = 2222688888920. Its totient is φ = 1111344444456.

The previous prime is 1667016666671. The next prime is 1667016666701. The reversal of 1667016666687 is 7866666107661.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1667016666687 - 2⁴ = 1667016666671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1667016666617) 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 3 ways as a sum of consecutive naturals, for example, 277836111112 + ... + 277836111117.

It is an arithmetic number, because the mean of its divisors is an integer number (555672222230).

Almost surely, 2^{1667016666687} is an apocalyptic number.

1667016666687 is a deficient number, since it is larger than the sum of its proper divisors (555672222233).

1667016666687 is an equidigital number, since it uses as much as digits as its factorization.

1667016666687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 555672222232.

The product of its (nonzero) digits is 109734912, while the sum is 66.

The spelling of 1667016666687 in words is "one trillion, six hundred sixty-seven billion, sixteen million, six hundred sixty-six thousand, six hundred eighty-seven".