1686608445 has 16 divisors (see below), whose sum is σ = 2699206272. Its totient is φ = 899313600.

The previous prime is 1686608299. The next prime is 1686608447. The reversal of 1686608445 is 5448066861.

It is not a de Polignac number, because 1686608445 - 2¹² = 1686604349 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1686608394 and 1686608403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1686608447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69759 + ... + 90771.

It is an arithmetic number, because the mean of its divisors is an integer number (168700392).

Almost surely, 2^1686608445 is an apocalyptic number.

1686608445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1686608445 is a deficient number, since it is larger than the sum of its proper divisors (1012597827).

1686608445 is a wasteful number, since it uses less digits than its factorization.

1686608445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26372.

The product of its (nonzero) digits is 1105920, while the sum is 48.

The square root of 1686608445 is about 41068.3387173136. The cubic root of 1686608445 is about 1190.3410845823.

The spelling of 1686608445 in words is "one billion, six hundred eighty-six million, six hundred eight thousand, four hundred forty-five".