6685815630 has 128 divisors (see below), whose sum is σ = 17540167680. Its totient is φ = 1621186560.

The previous prime is 6685815629. The next prime is 6685815667. The reversal of 6685815630 is 365185866.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 6685815630.

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, 9298411 + ... + 9299129.

It is an arithmetic number, because the mean of its divisors is an integer number (137032560).

Almost surely, 2^6685815630 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6685815630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8770083840).

6685815630 is an abundant number, since it is smaller than the sum of its proper divisors (10854352050).

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

6685815630 is a wasteful number, since it uses less digits than its factorization.

6685815630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1066.

The product of its (nonzero) digits is 1036800, while the sum is 48.

The square root of 6685815630 is about 81766.8369817495. The cubic root of 6685815630 is about 1883.8723216426.

The spelling of 6685815630 in words is "six billion, six hundred eighty-five million, eight hundred fifteen thousand, six hundred thirty".