6855805215 has 48 divisors (see below), whose sum is σ = 13635288576. Its totient is φ = 3121560000.

The previous prime is 6855805211. The next prime is 6855805223. The reversal of 6855805215 is 5125085586.

6855805215 is a `hidden beast` number, since 6 + 8 + 5 + 580 + 52 + 15 = 666.

It is not a de Polignac number, because 6855805215 - 2² = 6855805211 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6855805211) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 35710 + ... + 122420.

It is an arithmetic number, because the mean of its divisors is an integer number (284068512).

Almost surely, 2^6855805215 is an apocalyptic number.

6855805215 is a deficient number, since it is larger than the sum of its proper divisors (6779483361).

6855805215 is a wasteful number, since it uses less digits than its factorization.

6855805215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86980 (or 86977 counting only the distinct ones).

The product of its (nonzero) digits is 480000, while the sum is 45.

The square root of 6855805215 is about 82799.7899453857. The cubic root of 6855805215 is about 1899.7049601892.

The spelling of 6855805215 in words is "six billion, eight hundred fifty-five million, eight hundred five thousand, two hundred fifteen".