6866815620 has 192 divisors, whose sum is σ = 22517784576. Its totient is φ = 1530938880.

The previous prime is 6866815609. The next prime is 6866815621. The reversal of 6866815620 is 265186686.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 6866815620.

It is not an unprimeable number, because it can be changed into a prime (6866815621) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 10679019 + ... + 10679661.

It is an arithmetic number, because the mean of its divisors is an integer number (117280128).

Almost surely, 2^6866815620 is an apocalyptic number.

6866815620 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6866815620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11258892288).

6866815620 is an abundant number, since it is smaller than the sum of its proper divisors (15650968956).

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

6866815620 is a wasteful number, since it uses less digits than its factorization.

6866815620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1250 (or 1248 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 48.

The square root of 6866815620 is about 82866.2513934352. The cubic root of 6866815620 is about 1900.7213899653.

The spelling of 6866815620 in words is "six billion, eight hundred sixty-six million, eight hundred fifteen thousand, six hundred twenty".