6687406845 has 32 divisors (see below), whose sum is σ = 13587114240. Its totient is φ = 3057099840.

The previous prime is 6687406823. The next prime is 6687406871. The reversal of 6687406845 is 5486047866.

It is not a de Polignac number, because 6687406845 - 2¹² = 6687402749 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 6687406791 and 6687406800.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3537366 + ... + 3539255.

It is an arithmetic number, because the mean of its divisors is an integer number (424597320).

Almost surely, 2^6687406845 is an apocalyptic number.

It is an amenable number.

6687406845 is an abundant number, since it is smaller than the sum of its proper divisors (6899707395).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6687406845 is a wasteful number, since it uses less digits than its factorization.

6687406845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7076642 (or 7076636 counting only the distinct ones).

The product of its (nonzero) digits is 7741440, while the sum is 54.

The square root of 6687406845 is about 81776.5666007078. The cubic root of 6687406845 is about 1884.0217628019.

The spelling of 6687406845 in words is "six billion, six hundred eighty-seven million, four hundred six thousand, eight hundred forty-five".