6395520681 has 12 divisors (see below), whose sum is σ = 10077790320. Its totient is φ = 3876073080.

The previous prime is 6395520643. The next prime is 6395520727. The reversal of 6395520681 is 1860255936.

6395520681 is a `hidden beast` number, since 6 + 39 + 552 + 0 + 68 + 1 = 666.

It is not a de Polignac number, because 6395520681 - 2¹⁰ = 6395519657 is a prime.

It is a super-2 number, since 2×6395520681² = 81805369562197407522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6395520601) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32300511 + ... + 32300708.

It is an arithmetic number, because the mean of its divisors is an integer number (839815860).

Almost surely, 2^6395520681 is an apocalyptic number.

It is an amenable number.

6395520681 is a deficient number, since it is larger than the sum of its proper divisors (3682269639).

6395520681 is a wasteful number, since it uses less digits than its factorization.

6395520681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64601236 (or 64601233 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 45.

The square root of 6395520681 is about 79971.9993560246. Note that the first 3 decimals coincide. The cubic root of 6395520681 is about 1856.2022832478.

It can be divided in two parts, 6395 and 520681, that added together give a square (527076 = 726²).

The spelling of 6395520681 in words is "six billion, three hundred ninety-five million, five hundred twenty thousand, six hundred eighty-one".