1686851845 has 64 divisors (see below), whose sum is σ = 2458368000. Its totient is φ = 1086898176.

The previous prime is 1686851833. The next prime is 1686851851. The reversal of 1686851845 is 5481586861.

It is not a de Polignac number, because 1686851845 - 2¹⁵ = 1686819077 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1686851792 and 1686851801.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8740069 + ... + 8740261.

It is an arithmetic number, because the mean of its divisors is an integer number (38412000).

Almost surely, 2^1686851845 is an apocalyptic number.

It is an amenable number.

1686851845 is a deficient number, since it is larger than the sum of its proper divisors (771516155).

1686851845 is a wasteful number, since it uses less digits than its factorization.

1686851845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422.

The product of its digits is 1843200, while the sum is 52.

The square root of 1686851845 is about 41071.3019637800. The cubic root of 1686851845 is about 1190.3983425042.

The spelling of 1686851845 in words is "one billion, six hundred eighty-six million, eight hundred fifty-one thousand, eight hundred forty-five".