1678686671 has 8 divisors (see below), whose sum is σ = 1759979904. Its totient is φ = 1598085720.

The previous prime is 1678686661. The next prime is 1678686677. The reversal of 1678686671 is 1766868761.

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 1678686671 - 2¹⁰ = 1678685647 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 (1678686677) 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 7 ways as a sum of consecutive naturals, for example, 168101 + ... + 177806.

It is an arithmetic number, because the mean of its divisors is an integer number (219997488).

Almost surely, 2^1678686671 is an apocalyptic number.

1678686671 is a deficient number, since it is larger than the sum of its proper divisors (81293233).

1678686671 is a wasteful number, since it uses less digits than its factorization.

1678686671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346141.

The product of its digits is 4064256, while the sum is 56.

The square root of 1678686671 is about 40971.7789582049. The cubic root of 1678686671 is about 1188.4745349915.

The spelling of 1678686671 in words is "one billion, six hundred seventy-eight million, six hundred eighty-six thousand, six hundred seventy-one".