6686821900 has 72 divisors (see below), whose sum is σ = 16046566704. Its totient is φ = 2398233600.

The previous prime is 6686821873. The next prime is 6686821919. The reversal of 6686821900 is 91286866.

It is a super-2 number, since 2×6686821900² = 89427174244639220000, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38664 + ... + 121936.

It is an arithmetic number, because the mean of its divisors is an integer number (222868982).

Almost surely, 2^6686821900 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6686821900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8023283352).

6686821900 is an abundant number, since it is smaller than the sum of its proper divisors (9359744804).

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

6686821900 is a wasteful number, since it uses less digits than its factorization.

6686821900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83371 (or 83364 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 46.

The square root of 6686821900 is about 81772.9900394990. The cubic root of 6686821900 is about 1883.9668296382.

The spelling of 6686821900 in words is "six billion, six hundred eighty-six million, eight hundred twenty-one thousand, nine hundred".