6855251520 has 224 divisors, whose sum is σ = 23671694592. Its totient is φ = 1670750208.

The previous prime is 6855251519. The next prime is 6855251527. The reversal of 6855251520 is 251525586.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (6855251527) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1282774 + ... + 1288106.

It is an arithmetic number, because the mean of its divisors is an integer number (105677208).

Almost surely, 2^6855251520 is an apocalyptic number.

6855251520 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 6855251520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11835847296).

6855251520 is an abundant number, since it is smaller than the sum of its proper divisors (16816443072).

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

6855251520 is a wasteful number, since it uses less digits than its factorization.

6855251520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5469 (or 5459 counting only the distinct ones).

The product of its (nonzero) digits is 120000, while the sum is 39.

The square root of 6855251520 is about 82796.4463005508. The cubic root of 6855251520 is about 1899.6538168918.

The spelling of 6855251520 in words is "six billion, eight hundred fifty-five million, two hundred fifty-one thousand, five hundred twenty".