6601686 has 64 divisors (see below), whose sum is σ = 16547328. Its totient is φ = 1709568.

The previous prime is 6601649. The next prime is 6601691. The reversal of 6601686 is 6861066.

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, 58366 + ... + 58478.

It is an arithmetic number, because the mean of its divisors is an integer number (258552).

Almost surely, 2^6601686 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6601686, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8273664).

6601686 is an abundant number, since it is smaller than the sum of its proper divisors (9945642).

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

6601686 is a wasteful number, since it uses less digits than its factorization.

6601686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 6601686 is about 2569.3746320846. The cubic root of 6601686 is about 187.5937167060.

It can be divided in two parts, 660 and 1686, that added together give a triangular number (2346 = T₆₈).

The spelling of 6601686 in words is "six million, six hundred one thousand, six hundred eighty-six".