1667201686687 has 8 divisors (see below), whose sum is σ = 1690709434272. Its totient is φ = 1643694662400.

The previous prime is 1667201686681. The next prime is 1667201686727. The reversal of 1667201686687 is 7866861027661.

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

It is a cyclic number.

It is not a de Polignac number, because 1667201686687 - 2⁷ = 1667201686559 is a prime.

It is a super-2 number, since 2×1667201686687² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1667201686681) 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 7 ways as a sum of consecutive naturals, for example, 5886487 + ... + 6163207.

It is an arithmetic number, because the mean of its divisors is an integer number (211338679284).

Almost surely, 2^{1667201686687} is an apocalyptic number.

1667201686687 is a deficient number, since it is larger than the sum of its proper divisors (23507747585).

1667201686687 is an equidigital number, since it uses as much as digits as its factorization.

1667201686687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361649.

The product of its (nonzero) digits is 48771072, while the sum is 64.

The spelling of 1667201686687 in words is "one trillion, six hundred sixty-seven billion, two hundred one million, six hundred eighty-six thousand, six hundred eighty-seven".